diff --git a/php/.gitignore b/php/.gitignore
new file mode 100644
index 0000000..a725465
--- /dev/null
+++ b/php/.gitignore
@@ -0,0 +1 @@
+vendor/
\ No newline at end of file
diff --git a/php/composer.json b/php/composer.json
index ad162fd..2273e21 100644
--- a/php/composer.json
+++ b/php/composer.json
@@ -1,5 +1,5 @@
 {
-    "name": "password-validator",
+    "name": "murcia-software-crafter/password-validator",
     "require": {
         "php": "^7.1"
     },
diff --git a/php/composer.lock b/php/composer.lock
index 26078e4..0885ac2 100644
--- a/php/composer.lock
+++ b/php/composer.lock
@@ -1,41 +1,41 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "hash": "e3271f6296832f1cc20e8c9f476d7c07",
-    "content-hash": "ebbbdea3e1c747bbd4649602f217534f",
+    "content-hash": "84c15df48a76c006c11c486606c2520d",
     "packages": [],
     "packages-dev": [
         {
             "name": "composer/ca-bundle",
-            "version": "1.1.4",
+            "version": "1.3.1",
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                 "type": "git",
                 "url": "https://github.com/composer/ca-bundle.git",
-                "reference": "558f321c52faeb4828c03e7dc0cfe39a09e09a2d"
+                "reference": "4c679186f2aca4ab6a0f1b0b9cf9252decb44d0b"
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-                "reference": "558f321c52faeb4828c03e7dc0cfe39a09e09a2d",
+                "url": "https://api.github.com/repos/composer/ca-bundle/zipball/4c679186f2aca4ab6a0f1b0b9cf9252decb44d0b",
+                "reference": "4c679186f2aca4ab6a0f1b0b9cf9252decb44d0b",
                 "shasum": ""
             },
             "require": {
                 "ext-openssl": "*",
                 "ext-pcre": "*",
-                "php": "^5.3.2 || ^7.0"
+                "php": "^5.3.2 || ^7.0 || ^8.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5",
+                "phpstan/phpstan": "^0.12.55",
                 "psr/log": "^1.0",
-                "symfony/process": "^2.5 || ^3.0 || ^4.0"
+                "symfony/phpunit-bridge": "^4.2 || ^5",
+                "symfony/process": "^2.5 || ^3.0 || ^4.0 || ^5.0 || ^6.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.x-dev"
+                    "dev-main": "1.x-dev"
                 }
             },
             "autoload": {
@@ -62,28 +62,48 @@
                 "ssl",
                 "tls"
             ],
-            "time": "2019-01-28 09:30:10"
+            "support": {
+                "irc": "irc://irc.freenode.org/composer",
+                "issues": "https://github.com/composer/ca-bundle/issues",
+                "source": "https://github.com/composer/ca-bundle/tree/1.3.1"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-10-28T20:44:15+00:00"
         },
         {
             "name": "composer/xdebug-handler",
-            "version": "1.3.2",
+            "version": "1.4.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/xdebug-handler.git",
-                "reference": "d17708133b6c276d6e42ef887a877866b909d892"
+                "reference": "f27e06cd9675801df441b3656569b328e04aa37c"
             },
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-                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/d17708133b6c276d6e42ef887a877866b909d892",
-                "reference": "d17708133b6c276d6e42ef887a877866b909d892",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/f27e06cd9675801df441b3656569b328e04aa37c",
+                "reference": "f27e06cd9675801df441b3656569b328e04aa37c",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.2 || ^7.0",
+                "php": "^5.3.2 || ^7.0 || ^8.0",
                 "psr/log": "^1.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5"
+                "phpstan/phpstan": "^0.12.55",
+                "symfony/phpunit-bridge": "^4.2 || ^5"
             },
             "type": "library",
             "autoload": {
@@ -101,43 +121,59 @@
                     "email": "john-stevenson@blueyonder.co.uk"
                 }
             ],
-            "description": "Restarts a process without xdebug.",
+            "description": "Restarts a process without Xdebug.",
             "keywords": [
                 "Xdebug",
                 "performance"
             ],
-            "time": "2019-01-28 20:25:53"
+            "support": {
+                "irc": "irc://irc.freenode.org/composer",
+                "issues": "https://github.com/composer/xdebug-handler/issues",
+                "source": "https://github.com/composer/xdebug-handler/tree/1.4.6"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-03-25T17:01:18+00:00"
         },
         {
             "name": "doctrine/instantiator",
-            "version": "1.1.0",
+            "version": "1.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda"
+                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b"
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-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda",
-                "reference": "185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/d56bf6102915de5702778fe20f2de3b2fe570b5b",
+                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "require-dev": {
-                "athletic/athletic": "~0.1.8",
+                "doctrine/coding-standard": "^8.0",
                 "ext-pdo": "*",
                 "ext-phar": "*",
-                "phpunit/phpunit": "^6.2.3",
-                "squizlabs/php_codesniffer": "^3.0.2"
+                "phpbench/phpbench": "^0.13 || 1.0.0-alpha2",
+                "phpstan/phpstan": "^0.12",
+                "phpstan/phpstan-phpunit": "^0.12",
+                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
             },
             "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.2.x-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
@@ -151,16 +187,34 @@
                 {
                     "name": "Marco Pivetta",
                     "email": "ocramius@gmail.com",
-                    "homepage": "http://ocramius.github.com/"
+                    "homepage": "https://ocramius.github.io/"
                 }
             ],
             "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
-            "homepage": "https://github.com/doctrine/instantiator",
+            "homepage": "https://www.doctrine-project.org/projects/instantiator.html",
             "keywords": [
                 "constructor",
                 "instantiate"
             ],
-            "time": "2017-07-22 11:58:36"
+            "support": {
+                "issues": "https://github.com/doctrine/instantiator/issues",
+                "source": "https://github.com/doctrine/instantiator/tree/1.4.0"
+            },
+            "funding": [
+                {
+                    "url": "https://www.doctrine-project.org/sponsorship.html",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.patreon.com/phpdoctrine",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Finstantiator",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-11-10T18:47:58+00:00"
         },
         {
             "name": "infection/infection",
@@ -249,27 +303,31 @@
                 "testing",
                 "unit testing"
             ],
-            "time": "2019-02-10 18:24:30"
+            "support": {
+                "issues": "https://github.com/infection/infection/issues",
+                "source": "https://github.com/infection/infection/tree/0.12"
+            },
+            "time": "2019-02-10T18:24:30+00:00"
         },
         {
             "name": "justinrainbow/json-schema",
-            "version": "5.2.8",
+            "version": "5.2.11",
             "source": {
                 "type": "git",
                 "url": "https://github.com/justinrainbow/json-schema.git",
-                "reference": "dcb6e1006bb5fd1e392b4daa68932880f37550d4"
+                "reference": "2ab6744b7296ded80f8cc4f9509abbff393399aa"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/justinrainbow/json-schema/zipball/dcb6e1006bb5fd1e392b4daa68932880f37550d4",
-                "reference": "dcb6e1006bb5fd1e392b4daa68932880f37550d4",
+                "url": "https://api.github.com/repos/justinrainbow/json-schema/zipball/2ab6744b7296ded80f8cc4f9509abbff393399aa",
+                "reference": "2ab6744b7296ded80f8cc4f9509abbff393399aa",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.3"
             },
             "require-dev": {
-                "friendsofphp/php-cs-fixer": "~2.2.20",
+                "friendsofphp/php-cs-fixer": "~2.2.20||~2.15.1",
                 "json-schema/json-schema-test-suite": "1.2.0",
                 "phpunit/phpunit": "^4.8.35"
             },
@@ -315,24 +373,28 @@
                 "json",
                 "schema"
             ],
-            "time": "2019-01-14 23:55:14"
+            "support": {
+                "issues": "https://github.com/justinrainbow/json-schema/issues",
+                "source": "https://github.com/justinrainbow/json-schema/tree/5.2.11"
+            },
+            "time": "2021-07-22T09:24:00+00:00"
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.8.1",
+            "version": "1.10.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "3e01bdad3e18354c3dce54466b7fbe33a9f9f7f8"
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/3e01bdad3e18354c3dce54466b7fbe33a9f9f7f8",
-                "reference": "3e01bdad3e18354c3dce54466b7fbe33a9f9f7f8",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/776f831124e9c62e1a2c601ecc52e776d8bb7220",
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "replace": {
                 "myclabs/deep-copy": "self.version"
@@ -363,20 +425,30 @@
                 "object",
                 "object graph"
             ],
-            "time": "2018-06-11 23:09:50"
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.10.2"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-11-13T09:40:50+00:00"
         },
         {
             "name": "nikic/php-parser",
-            "version": "v4.2.1",
+            "version": "v4.13.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "5221f49a608808c1e4d436df32884cbc1b821ac0"
+                "reference": "50953a2691a922aa1769461637869a0a2faa3f53"
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             "dist": {
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-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/5221f49a608808c1e4d436df32884cbc1b821ac0",
-                "reference": "5221f49a608808c1e4d436df32884cbc1b821ac0",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/50953a2691a922aa1769461637869a0a2faa3f53",
+                "reference": "50953a2691a922aa1769461637869a0a2faa3f53",
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@@ -384,7 +456,8 @@
                 "php": ">=7.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6.5 || ^7.0"
+                "ircmaxell/php-yacc": "^0.0.7",
+                "phpunit/phpunit": "^6.5 || ^7.0 || ^8.0 || ^9.0"
             },
             "bin": [
                 "bin/php-parse"
@@ -392,7 +465,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.2-dev"
+                    "dev-master": "4.9-dev"
                 }
             },
             "autoload": {
@@ -414,38 +487,43 @@
                 "parser",
                 "php"
             ],
-            "time": "2019-02-16 20:54:15"
+            "support": {
+                "issues": "https://github.com/nikic/PHP-Parser/issues",
+                "source": "https://github.com/nikic/PHP-Parser/tree/v4.13.0"
+            },
+            "time": "2021-09-20T12:20:58+00:00"
         },
         {
             "name": "ocramius/package-versions",
-            "version": "1.4.0",
+            "version": "1.9.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Ocramius/PackageVersions.git",
-                "reference": "a4d4b60d0e60da2487bd21a2c6ac089f85570dbb"
+                "reference": "94c9d42a466c57f91390cdd49c81313264f49d85"
             },
             "dist": {
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-                "url": "https://api.github.com/repos/Ocramius/PackageVersions/zipball/a4d4b60d0e60da2487bd21a2c6ac089f85570dbb",
-                "reference": "a4d4b60d0e60da2487bd21a2c6ac089f85570dbb",
+                "url": "https://api.github.com/repos/Ocramius/PackageVersions/zipball/94c9d42a466c57f91390cdd49c81313264f49d85",
+                "reference": "94c9d42a466c57f91390cdd49c81313264f49d85",
                 "shasum": ""
             },
             "require": {
-                "composer-plugin-api": "^1.0.0",
-                "php": "^7.1.0"
+                "composer-plugin-api": "^1.1.0 || ^2.0",
+                "php": "^7.4.0"
             },
             "require-dev": {
-                "composer/composer": "^1.6.3",
-                "doctrine/coding-standard": "^5.0.1",
-                "ext-zip": "*",
-                "infection/infection": "^0.7.1",
-                "phpunit/phpunit": "^7.0.0"
+                "composer/composer": "^1.9.3 || ^2.0@dev",
+                "doctrine/coding-standard": "^7.0.2",
+                "ext-zip": "^1.15.0",
+                "infection/infection": "^0.15.3",
+                "phpunit/phpunit": "^9.1.1",
+                "vimeo/psalm": "^3.9.3"
             },
             "type": "composer-plugin",
             "extra": {
                 "class": "PackageVersions\\Installer",
                 "branch-alias": {
-                    "dev-master": "2.0.x-dev"
+                    "dev-master": "1.99.x-dev"
                 }
             },
             "autoload": {
@@ -464,7 +542,21 @@
                 }
             ],
             "description": "Composer plugin that provides efficient querying for installed package versions (no runtime IO)",
-            "time": "2019-02-21 12:16:21"
+            "support": {
+                "issues": "https://github.com/Ocramius/PackageVersions/issues",
+                "source": "https://github.com/Ocramius/PackageVersions/tree/1.9.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/Ocramius",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/ocramius/package-versions",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-06-22T14:15:44+00:00"
         },
         {
             "name": "padraic/humbug_get_contents",
@@ -519,7 +611,7 @@
                     "homepage": "http://blog.astrumfutura.com"
                 },
                 {
-                    "name": "Théo FIDRY",
+                    "name": "Théo Fidry",
                     "email": "theo.fidry@gmail.com"
                 }
             ],
@@ -533,7 +625,11 @@
                 "ssl",
                 "tls"
             ],
-            "time": "2018-02-12 18:47:17"
+            "support": {
+                "issues": "https://github.com/humbug/file_get_contents/issues",
+                "source": "https://github.com/humbug/file_get_contents/tree/master"
+            },
+            "time": "2018-02-12T18:47:17+00:00"
         },
         {
             "name": "padraic/phar-updater",
@@ -585,7 +681,12 @@
                 "self-update",
                 "update"
             ],
-            "time": "2018-03-30 12:52:15"
+            "support": {
+                "issues": "https://github.com/humbug/phar-updater/issues",
+                "source": "https://github.com/humbug/phar-updater/tree/1.0"
+            },
+            "abandoned": true,
+            "time": "2018-03-30T12:52:15+00:00"
         },
         {
             "name": "phar-io/manifest",
@@ -640,7 +741,11 @@
                 }
             ],
             "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
-            "time": "2018-07-08 19:23:20"
+            "support": {
+                "issues": "https://github.com/phar-io/manifest/issues",
+                "source": "https://github.com/phar-io/manifest/tree/master"
+            },
+            "time": "2018-07-08T19:23:20+00:00"
         },
         {
             "name": "phar-io/version",
@@ -687,39 +792,38 @@
                 }
             ],
             "description": "Library for handling version information and constraints",
-            "time": "2018-07-08 19:19:57"
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/master"
+            },
+            "time": "2018-07-08T19:19:57+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",
-            "version": "1.0.1",
+            "version": "2.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6"
+                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b"
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             "dist": {
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-                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/1d01c49d4ed62f25aa84a747ad35d5a16924662b",
+                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.5"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^4.6"
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0.x-dev"
+                    "dev-2.x": "2.x-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "phpDocumentor\\Reflection\\": [
-                        "src"
-                    ]
+                    "phpDocumentor\\Reflection\\": "src/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -741,44 +845,46 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2017-09-11 18:02:19"
+            "support": {
+                "issues": "https://github.com/phpDocumentor/ReflectionCommon/issues",
+                "source": "https://github.com/phpDocumentor/ReflectionCommon/tree/2.x"
+            },
+            "time": "2020-06-27T09:03:43+00:00"
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+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Contracts\\Service\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Generic abstractions related to writing services",
             "homepage": "https://symfony.com",
-            "time": "2019-01-24 22:05:03"
+            "keywords": [
+                "abstractions",
+                "contracts",
+                "decoupling",
+                "interfaces",
+                "interoperability",
+                "standards"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/service-contracts/tree/v1.1.2"
+            },
+            "time": "2019-05-28T07:50:59+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v4.2.3",
+            "version": "v4.4.29",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "d461670ee145092b7e2a56c1da7118f19cadadb0"
+                "reference": "3abcc4db06d4e776825eaa3ed8ad924d5bc7432a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/d461670ee145092b7e2a56c1da7118f19cadadb0",
-                "reference": "d461670ee145092b7e2a56c1da7118f19cadadb0",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/3abcc4db06d4e776825eaa3ed8ad924d5bc7432a",
+                "reference": "3abcc4db06d4e776825eaa3ed8ad924d5bc7432a",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1.3",
+                "php": ">=7.1.3",
                 "symfony/polyfill-ctype": "~1.8"
             },
             "conflict": {
                 "symfony/console": "<3.4"
             },
             "require-dev": {
-                "symfony/console": "~3.4|~4.0"
+                "symfony/console": "^3.4|^4.0|^5.0"
             },
             "suggest": {
                 "symfony/console": "For validating YAML files using the lint command"
             },
             "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "4.2-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "Symfony\\Component\\Yaml\\": ""
@@ -2412,29 +2933,46 @@
                     "homepage": "https://symfony.com/contributors"
                 }
             ],
-            "description": "Symfony Yaml Component",
+            "description": "Loads and dumps YAML files",
             "homepage": "https://symfony.com",
-            "time": "2019-01-16 20:35:37"
+            "support": {
+                "source": "https://github.com/symfony/yaml/tree/v4.4.29"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-07-27T16:19:30+00:00"
         },
         {
             "name": "theseer/tokenizer",
-            "version": "1.1.0",
+            "version": "1.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/theseer/tokenizer.git",
-                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b"
+                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/cb2f008f3f05af2893a87208fe6a6c4985483f8b",
-                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/34a41e998c2183e22995f158c581e7b5e755ab9e",
+                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
                 "ext-tokenizer": "*",
                 "ext-xmlwriter": "*",
-                "php": "^7.0"
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "autoload": {
@@ -2454,34 +2992,47 @@
                 }
             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
-            "time": "2017-04-07 12:08:54"
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-07-28T10:34:58+00:00"
         },
         {
             "name": "webmozart/assert",
-            "version": "1.4.0",
+            "version": "1.10.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
-                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9"
+                "url": "https://github.com/webmozarts/assert.git",
+                "reference": "6964c76c7804814a842473e0c8fd15bab0f18e25"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/83e253c8e0be5b0257b881e1827274667c5c17a9",
-                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/6964c76c7804814a842473e0c8fd15bab0f18e25",
+                "reference": "6964c76c7804814a842473e0c8fd15bab0f18e25",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.3 || ^7.0",
+                "php": "^7.2 || ^8.0",
                 "symfony/polyfill-ctype": "^1.8"
             },
+            "conflict": {
+                "phpstan/phpstan": "<0.12.20",
+                "vimeo/psalm": "<4.6.1 || 4.6.2"
+            },
             "require-dev": {
-                "phpunit/phpunit": "^4.6",
-                "sebastian/version": "^1.0.1"
+                "phpunit/phpunit": "^8.5.13"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.3-dev"
+                    "dev-master": "1.10-dev"
                 }
             },
             "autoload": {
@@ -2505,7 +3056,11 @@
                 "check",
                 "validate"
             ],
-            "time": "2018-12-25 11:19:39"
+            "support": {
+                "issues": "https://github.com/webmozarts/assert/issues",
+                "source": "https://github.com/webmozarts/assert/tree/1.10.0"
+            },
+            "time": "2021-03-09T10:59:23+00:00"
         }
     ],
     "aliases": [],
@@ -2516,5 +3071,6 @@
     "platform": {
         "php": "^7.1"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.1.0"
 }
diff --git a/php/src/PasswordValidator.php b/php/src/PasswordValidator.php
index e5167ff..b8c17ae 100644
--- a/php/src/PasswordValidator.php
+++ b/php/src/PasswordValidator.php
@@ -1,11 +1,29 @@
 <?php
 
+declare(strict_types=1);
+
 namespace PasswordValidator;
 
-class PasswordValidator
+final class PasswordValidator
 {
-    public function changeMe(): bool
+    private const MINIMUM_LENGTH = 8;
+    private const AT_LEAST_A_CAPITAL_LETTER = '/[A-Z]/';
+    private const AT_LEAST_A_LOWER_LETTER = '/[a-z]/';
+    private const AT_LEAST_A_NUMBER = '/[0-9]/';
+    private const AT_LEAST_A_UNDERSCORE = '/[_]/';
+
+    public function validate(string $password): bool
     {
-        return true;
+        $hasEnoughLength = mb_strlen($password) > self::MINIMUM_LENGTH;
+
+        $hasCapitalLetter = preg_match(self::AT_LEAST_A_CAPITAL_LETTER, $password);
+
+        $hasLowerCaseLetter = preg_match(self::AT_LEAST_A_LOWER_LETTER, $password);
+
+        $hasANumber = preg_match(self::AT_LEAST_A_NUMBER, $password);
+
+        $hasAnUnderscore = preg_match(self::AT_LEAST_A_UNDERSCORE, $password);
+
+        return $hasEnoughLength && $hasCapitalLetter && $hasLowerCaseLetter && $hasANumber && $hasAnUnderscore;
     }
 }
diff --git a/php/tests/PasswordValidatorTest.php b/php/tests/PasswordValidatorTest.php
index afe0e64..444adb8 100644
--- a/php/tests/PasswordValidatorTest.php
+++ b/php/tests/PasswordValidatorTest.php
@@ -1,16 +1,73 @@
 <?php
 
+declare(strict_types=1);
 namespace PasswordValidator\Test;
 
 use PasswordValidator\PasswordValidator;
 use PHPUnit\Framework\TestCase;
 
-class PasswordValidatorTest extends TestCase
+final class PasswordValidatorTest extends TestCase
 {
+    /**
+    - Have more than 8 characters
+    - Contains a capital letter
+    - Contains a lowercase
+    - Contains a number
+    - Contains an underscore
+     */
+
+    private const MORE_THAN_8_CHARS = "########";
+    private const CAPITAL_LETTER = "A";
+    private const LOWER_CASE = "b";
+    private const NUMBER = "1";
+    private const UNDERSCORE = "_";
+    
+    /** @test */
+    public function should_validate_password_is_longer_than_eight_chars(): void
+    {
+        $password = self::MORE_THAN_8_CHARS . self::CAPITAL_LETTER . self::LOWER_CASE . self::NUMBER . self::UNDERSCORE;
+        $passwordValidator = new PasswordValidator();
+        $this->assertTrue($passwordValidator->validate($password));
+    }
+
+    /** @test */
+    public function should_not_be_valid_less_than_eight_char(): void
+    {
+        $password = self::CAPITAL_LETTER . self::LOWER_CASE . self::NUMBER . self::UNDERSCORE;
+        $passwordValidator = new PasswordValidator();
+        $this->assertFalse($passwordValidator->validate($password));
+    }
+
     /** @test */
-    public function change_me()
+    public function should_have_at_least_capital_letter(): void
     {
+        $password = self::MORE_THAN_8_CHARS . self::LOWER_CASE . self::NUMBER . self::UNDERSCORE;
         $passwordValidator = new PasswordValidator();
-        $this->assertTrue($passwordValidator->changeMe());
+        $this->assertFalse($passwordValidator->validate($password));
     }
+
+    /** @test */
+    public function should_have_at_one_lower_case_letter(): void
+    {
+        $password = self::MORE_THAN_8_CHARS . self::CAPITAL_LETTER . self::NUMBER . self::UNDERSCORE;
+        $passwordValidator = new PasswordValidator();
+        $this->assertFalse($passwordValidator->validate($password));
+    }
+
+    /** @test */
+    public function should_have_at_least_one_number(): void
+    {
+        $password = self::MORE_THAN_8_CHARS . self::CAPITAL_LETTER . self::LOWER_CASE . self::UNDERSCORE;
+        $passwordValidator = new PasswordValidator();
+        $this->assertFalse($passwordValidator->validate($password));
+    }
+
+    /** @test */
+    public function should_have_at_least_one_underscore(): void
+    {
+        $password = self::MORE_THAN_8_CHARS . self::CAPITAL_LETTER . self::LOWER_CASE . self::NUMBER;
+        $passwordValidator = new PasswordValidator();
+        $this->assertFalse($passwordValidator->validate($password));
+    }
+
 }