Driver/PHP: Add AMPHP and PDO_PGSQL

Author: amotl

docs/connect/php.md

@@ -3,45 +3,96 @@
 # PHP
 
 :::{div} sd-text-muted
-Available PHP extensions for CrateDB and CrateDB Cloud.
+Available PHP drivers and adapters for CrateDB and CrateDB Cloud.
 :::
 
-## PDO
+## AMPHP PostgreSQL driver
+
+The [AMPHP PostgreSQL driver], `amphp/postgres`, is an asynchronous
+PostgreSQL client based on Amp.
+
+:::{rubric} Synopsis
+:::
+```php
+<?php
+use Amp\Postgres\PostgresConfig;
+use Amp\Postgres\PostgresConnectionPool;
+
+$config = PostgresConfig::fromString("host=localhost user=crate");
+
+$pool = new PostgresConnectionPool($config);
+
+$statement = $pool->prepare("SELECT * FROM sys.summits ORDER BY height DESC LIMIT 3");
+
+$result = $statement->execute();
+foreach ($result as $row) {
+    print_r($row);
+}
+?>
+```
+:::{rubric} Example
+:::
+- [Connect to CrateDB and CrateDB Cloud using AMPHP/PostgreSQL] &nbsp; [![PHP AMPHP](https://github.com/crate/cratedb-examples/actions/workflows/lang-php-amphp.yml/badge.svg)](https://github.com/crate/cratedb-examples/actions/workflows/lang-php-amphp.yml)
+
+## PostgreSQL PDO driver
+
+[PDO_PGSQL] is a PHP-native driver that implements the PHP Data Objects (PDO)
+interface to enable access from PHP to PostgreSQL databases. 
+
+:::{rubric} Synopsis
+:::
+```php
+<?php
+$connection = new PDO("pgsql:host=localhost;port=5432;user=crate");
+$cursor = $connection->query("SELECT * FROM sys.summits ORDER BY height DESC LIMIT 3");
+print_r($cursor->fetchAll(PDO::FETCH_ASSOC));
+?>
+```
+
+:::{rubric} Example
+:::
+- [Use the PDO_PGSQL driver with CrateDB] &nbsp; [![PHP PDO](https://github.com/crate/cratedb-examples/actions/workflows/lang-php-pdo.yml/badge.svg)](https://github.com/crate/cratedb-examples/actions/workflows/lang-php-pdo.yml)
+
+## CrateDB PDO driver
 
 The PHP Data Objects (PDO) is a standard PHP extension that defines a common
 interface for accessing databases in PHP.
+The {ref}`crate-pdo:index` implements this specification, wrapping access to
+CrateDB's HTTP interface.
 
-Example implementation will look like this:
-
+:::{rubric} Synopsis
+:::
 ```php
 <?php
 
 require 'vendor/autoload.php';
 
-use Crate\PDO\PDO as PDO;
-
-$pdo = new PDO(
-    'crate:<name-of-your-cluster>.cratedb.net:4200',
-    'admin',
-    '<PASSWORD>'
-);
+use Crate\PDO\PDOCrateDB;
 
-$stm = $pdo->query('SELECT name FROM sys.cluster');
-$name = $stm->fetch();
-print $name[0];
+$dsn = '<DATA_SOURCE_NAME>';
+$user = 'crate';
+$password = null;
+$options = null;
+$connection = new PDOCrateDB($dsn, $user, $password, $options);
 
+$stm = $connection->query("SELECT * FROM sys.summits ORDER BY height DESC LIMIT 3");
+$result = $stm->fetch();
+print_r($result);
 ?>
 ```
 
-See full documentation {ref}`here <crate-pdo:index>`.
+[![Tests](https://github.com/crate/crate-pdo/actions/workflows/tests.yml/badge.svg)](https://github.com/crate/crate-pdo/actions/workflows/tests.yml)
 
-## DBAL
+## CrateDB DBAL adapter
 
 DBAL is a PHP database abstraction layer that comes with database schema
 introspection, schema management, and PDO support.
+The {ref}`crate-dbal:index` implements this specification, wrapping access to
+CrateDB's HTTP interface. The adapter currently does not support recent
+versions of the Doctrine ORM.
 
-Example implementation will look like this:
-
+:::{rubric} Synopsis
+:::
 ```php
 <?php
 
@@ -56,12 +107,17 @@ $params = array(
 );
 
 $connection = \Doctrine\DBAL\DriverManager::getConnection($params);
-$sql = 'SELECT name FROM sys.cluster';
-$name = $connection->query($sql)->fetch();
-
-print $name['name'];
+$sql = "SELECT * FROM sys.summits ORDER BY height DESC LIMIT 3";
+$result = $connection->query($sql)->fetch();
 
+print_r($result);
 ?>
 ```
 
-See full documentation {ref}`here <crate-dbal:index>`.
+[![Tests](https://github.com/crate/crate-dbal/actions/workflows/tests.yml/badge.svg)](https://github.com/crate/crate-dbal/actions/workflows/tests.yml)
+
+
+[AMPHP PostgreSQL driver]: https://github.com/amphp/postgres
+[Connect to CrateDB and CrateDB Cloud using AMPHP/PostgreSQL]: https://github.com/crate/cratedb-examples/tree/main/by-language/php-amphp
+[PDO_PGSQL]: https://www.php.net/manual/en/ref.pdo-pgsql.php
+[Use the PDO_PGSQL driver with CrateDB]: https://github.com/crate/cratedb-examples/tree/main/by-language/php-pdo