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padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="页面路径"><ul class="breadcrumbs"><li class="breadcrumbs__item"><a aria-label="主页面" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link">php</span></li></ul></nav><div class="theme-doc-markdown markdown"><header><h1>php</h1></header><div class="theme-admonition theme-admonition-danger admonition_xJq3 alert alert--danger"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M5.05.31c.81 2.17.41 3.38-.52 4.31C3.55 5.67 1.98 6.45.9 7.98c-1.45 2.05-1.7 6.53 3.53 7.7-2.2-1.16-2.67-4.52-.3-6.61-.61 2.03.53 3.33 1.94 2.86 1.39-.47 2.3.53 2.27 1.67-.02.78-.31 1.44-1.13 1.81 3.42-.59 4.78-3.42 4.78-5.56 0-2.84-2.53-3.22-1.25-5.61-1.52.13-2.03 1.13-1.89 2.75.09 1.08-1.02 1.8-1.86 1.33-.67-.41-.66-1.19-.06-1.78C8.18 5.31 8.68 2.45 5.05.32L5.03.3l.02.01z"></path></svg></span>危险</div><div class="admonitionContent_BuS1"><p>大学时候记的笔记，如今PHP已死</p></div></div>
<p><strong>单双引号</strong></p>
<div class="language-php codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-php codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain"><?php</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$value = 'abc';</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">echo "变量的值为$value"; // 输出abc</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">echo '变量的值为$value'; // 输出$value</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">echo '变量的值为'.$value; // 输出abc</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">?></span><br></span></code></pre></div></div>
<p><strong>数组</strong></p>
<div class="language-php codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-php codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">$arr = array('a', 'b', 'c');</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$arr1 = array("a"=>"aaa", "b"=>"bbb", "c"=>"ccc");</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">echo implode('=', $arr); // a=b=c</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">echo $arr1[1]; // bbb</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span></code></pre></div></div>
<p><strong>类</strong></p>
<div class="language-php codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-php codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">// 两个下划线开头的函数通常被称为魔术方法，包括__construct, __destruct, __call,</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">// __callStatic, __get, __set, __inset, __unset, __sleep, __wakeup, __clone等等。</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">class People {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> var $id; // 可以用public/protected/private</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> var $name;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> private $n;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // 构造函数</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> function __construct($id, $name, $n) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> $this->id = $id;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> $this->name = $name;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> $this->n = $n;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // 析构函数</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> function __destruct() {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // 搭配clone使用</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> function __clone() {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> echo "clone function"</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // 实例调用方法时，若找不到方法，则调用该函数</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> function __call($name, $arguments) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> echo 'call function';</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // 除此之外还有__callStatic，对应的是类方法</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // BTW，类外部调用类函数时 People::Fn，类内部调用时Self::Fn</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> static function __callStatic($name, $arguments) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> echo "$name".implode(',', $arguments);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // 获取 $p->n的值的时候，因为private，所以实际上无法访问该属性的值。</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // 此时会自动调用__get函数</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> function __get($property) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> echo $this->$property;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // 修改 $p->n的值的时候，因为private，所以实际上无法修改该属性的值。</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // 此时会自动调用__set函数</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> function __set($property, $value) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> $this->$property = $value;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> function getInfo() {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> echo $this->id.'号是'.$this->name;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">}</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$p = new People(1, 'akara');</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$p->getInfo();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$p->test(); // 找不到，所以调用__call函数</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">echo $p->n; // 调用__get函数</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$p->n = 1; // 调用__set函数</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$s = clone $p; // 调用__clone函数</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$data = serialize($arr); // 序列化</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">echo $data;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">unserialize($data); // 反序列化</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">// 调用serialize函数时，先会查找类中是否有__sleep，如果有则调用后再序列化</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">// 同理，调用unserialize时，查看是否有__wakeup，调用后才反序列化。</span><br></span></code></pre></div></div>
<p><strong>PHP连接数据库</strong></p>
<div class="language-php codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-php codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain"><?php</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> $link = mysqli_connect('localhost:3308', 'root', '');</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> mysqli_select_db($link, 'test');</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> $sql = "SELECT * FROM comments";</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> $result = mysqli_query($link, $sql);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> if (mysqli_num_rows($result) > 0) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> while ($row = mysqli_fetch_assoc($result)) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> mysqli_close($link)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">?></span><br></span></code></pre></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col"><a href="https://github.com/miusing/blog/tree/master/docs/php.mdx" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>编辑此页</a></div><div class="col lastUpdated_JAkA"></div></div></footer></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="文件选项卡"><a class="pagination-nav__link pagination-nav__link--prev" href="/webgl"><div class="pagination-nav__sublabel">上一页</div><div class="pagination-nav__label">Three.js</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/写在前面"><div class="pagination-nav__sublabel">下一页</div><div class="pagination-nav__label">写在前面</div></a></nav></div></div></div></div></main></div></div></div></div>
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