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150 lines
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HTML
150 lines
8.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>输出一个消息并且退出当前脚本</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.exit" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">exit</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">exit</span> — <span class="dc-title">输出一个消息并且退出当前脚本</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.exit-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>exit</strong></span>
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([ <span class="methodparam"><span class="type">string</span> <code class="parameter">$status</code></span>
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] ) : <span class="type"><span class="type void">void</span></span></div>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>exit</strong></span>
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( <span class="methodparam"><span class="type">int</span> <code class="parameter">$status</code></span>
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) : <span class="type"><span class="type void">void</span></span></div>
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<p class="para rdfs-comment">
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中止脚本的执行。
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尽管调用了 <span class="function"><strong>exit()</strong></span>，
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<a href="register_shutdown_function.html" class="link">Shutdown函数</a>
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以及 <a href="language.oop5.decon.html#language.oop5.decon.destructor" class="link">object destructors</a> 总是会被执行。
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</p>
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<p class="para">
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<em>exit</em> 是个语法结构，如果没有 <code class="parameter">status</code> 参数要传入，可以省略圆括号。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.exit-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">status</code></dt>
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<dd>
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<p class="para">
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如果 <code class="parameter">status</code> 是一个字符串，在退出之前该函数会打印
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<code class="parameter">status</code> 。
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</p>
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<p class="para">
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如果 <code class="parameter">status</code> 是一个 <span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>，该值会作为退出状态码，并且不会被打印输出。
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退出状态码应该在范围0至254，不应使用被PHP保留的退出状态码255。
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状态码0用于成功中止程序。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.exit-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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没有返回值。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.exit-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-4535">
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<p><strong>Example #1 <span class="function"><strong>exit()</strong></span> 例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br />$filename </span><span style="color: #007700">= </span><span style="color: #DD0000">'/path/to/data-file'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$file </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #0000BB">$filename</span><span style="color: #007700">, </span><span style="color: #DD0000">'r'</span><span style="color: #007700">)<br /> or exit(</span><span style="color: #DD0000">"unable to open file (</span><span style="color: #0000BB">$filename</span><span style="color: #DD0000">)"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-4536">
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<p><strong>Example #2 <span class="function"><strong>exit()</strong></span> 状态码例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">//exit program normally<br /></span><span style="color: #007700">exit;<br />exit();<br />exit(</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//exit with an error code<br /></span><span style="color: #007700">exit(</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br />exit(</span><span style="color: #0000BB">0376</span><span style="color: #007700">); </span><span style="color: #FF8000">//octal<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-4537">
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<p><strong>Example #3 无论如何，Shutdown函数与析构函数都会被执行</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">Foo<br /></span><span style="color: #007700">{<br /> public function </span><span style="color: #0000BB">__destruct</span><span style="color: #007700">()<br /> {<br /> echo </span><span style="color: #DD0000">'Destruct: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">__METHOD__ </span><span style="color: #007700">. </span><span style="color: #DD0000">'()' </span><span style="color: #007700">. </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br /> }<br />}<br /><br />function </span><span style="color: #0000BB">shutdown</span><span style="color: #007700">()<br />{<br /> echo </span><span style="color: #DD0000">'Shutdown: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">__FUNCTION__ </span><span style="color: #007700">. </span><span style="color: #DD0000">'()' </span><span style="color: #007700">. </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$foo </span><span style="color: #007700">= new </span><span style="color: #0000BB">Foo</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">register_shutdown_function</span><span style="color: #007700">(</span><span style="color: #DD0000">'shutdown'</span><span style="color: #007700">);<br /><br />exit();<br />echo </span><span style="color: #DD0000">'This will not be output.'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Shutdown: shutdown()
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Destruct: Foo::__destruct()
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.exit-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">因为是一个语言构造器而不是一个函数，不能被
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<a href="functions.variable_functions.html" class="link">可变函数</a> 调用。
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</span>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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该语法结构等同于 <span class="function"><a href="die.html" class="function">die()</a></span>。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.exit-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="register_shutdown_function.html" class="function" rel="rdfs-seeAlso">register_shutdown_function()</a> - 注册一个会在php中止时执行的函数</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |