return将程序控制返还给调用模块
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<p style="margin-left:0;"><span style="color:#333333;">（PHP 4、PHP 5、PHP 7、PHP 8）</span></p>
<p style="margin-left:0;"><span style="color:#333333;"><code>return</code>将程序控制返还给调用模块。 将在调用模块中执行的下一句表达式中继续。</span></p>
<p style="margin-left:0;"><span style="color:#333333;">如果在一个函数中调用 <strong>return</strong> 语句，将立即结束此函数的执行并将它的参数作为函数的值返回。<strong>return</strong> 也会终止 <ahref="https://www.php.net/manual/zh/function.eval.php">eval()</a> 语句或者脚本文件的执行。</span></p>
<p style="margin-left:0;"><span style="color:#333333;">如果在全局范围中调用，则当前脚本文件中止运行。如果当前脚本文件是被 <ahref="https://www.php.net/manual/zh/function.include.php">include</a> 的或者 <ahref="https://www.php.net/manual/zh/function.require.php">require</a> 的，则控制交回调用文件。此外，如果当前脚本是被 <ahref="https://www.php.net/manual/zh/function.include.php">include</a> 的，则 <strong>return</strong> 的值会被当作 <ahref="https://www.php.net/manual/zh/function.include.php">include</a> 调用的返回值。如果在主脚本文件中调用 <strong>return</strong>，则脚本中止运行。如果当前脚本文件是在 php.ini 中的配置选项 <ahref="https://www.php.net/manual/zh/ini.core.php#ini.auto-prepend-file">auto_prepend_file</a> 或者 <ahref="https://www.php.net/manual/zh/ini.core.php#ini.auto-append-file">auto_append_file</a> 所指定的，则此脚本文件中止运行。</span></p>
<p style="margin-left:0;"><span style="color:#333333;">更多信息见<ahref="https://www.php.net/manual/zh/functions.returning-values.php">返回值</a>。</span></p>
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<p style="margin-left:0;"><span style="color:#333333;"><strong>注意</strong>: 注意既然 <strong>return</strong> 是语言结构而不是函数，因此其参数没有必要用括号将其括起来，也不推荐这样用。</span></p>
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<p style="margin-left:0;"><span style="color:#333333;"><strong>注意</strong>: 如果没有提供参数，则一定不能用括号，此时返回 <strong><code>null</code></strong>。如果调用 <code>return</code> 时加上了括号却又没有参数会导致解析错误。</span></p>
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<p style="margin-left:0;"><span style="color:#333333;">自 PHP 7.1.0 起，如果返回类型需要是 void 而带了返回的参数， 将导致 <strong><code>E_COMPILE_ERROR</code></strong>； 相反返回类型需要而未带参数也会同样导致该错误。</span></p>
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<ahref="https://www.php.net/manual/zh/function.return.php#59866">warhog 在 warhog dot net</a>
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<span style="color:#666666;"><strong>16年前</strong></span>
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<span style="background-color:#ffffff;"><code><span style="color:#000000;">for those of you who think that using return in a script is the same as using exit note that: using return just exits the execution of the current script, exit the whole execution.<br><br> look at that example:<br><br> a.php<br><span style="color:#336699;"><?php</span><br><span style="color:#669933;">include(</span><span style="color:#cc3333;">"b.php"</span><span style="color:#669933;">);<br> echo </span><span style="color:#cc3333;">"a"</span><span style="color:#669933;">;</span><br><span style="color:#336699;">?></span><br><br> b.php<br><span style="color:#336699;"><?php</span><br><span style="color:#669933;">echo </span><span style="color:#cc3333;">"b"</span><span style="color:#669933;">;<br> return;</span><br><span style="color:#336699;">?></span><br><br> (executing a.php:) will echo "ba".<br><br> whereas (b.php modified):<br><br> a.php<br><span style="color:#336699;"><?php</span><br><span style="color:#669933;">include(</span><span style="color:#cc3333;">"b.php"</span><span style="color:#669933;">);<br> echo </span><span style="color:#cc3333;">"a"</span><span style="color:#669933;">;</span><br><span style="color:#336699;">?></span><br><br> b.php<br><span style="color:#336699;"><?php</span><br><span style="color:#669933;">echo </span><span style="color:#cc3333;">"b"</span><span style="color:#669933;">;<br> exit;</span><br><span style="color:#336699;">?></span><br><br> (executing a.php:) will echo "b".</span></code></span>
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<span style="color:#666666;"><strong>8 年前</strong></span>
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<span style="background-color:#ffffff;"><code><span style="color:#000000;">Note that because PHP processes the file before running it, any functions defined in an included file will still be available, even if the file is not executed.<br><br> Example:<br><br> a.php<br><span style="color:#336699;"><?php</span><br><span style="color:#669933;">include </span><span style="color:#cc3333;">'b.php'</span><span style="color:#669933;">;</span><br><br><span style="color:#336699;">foo</span><span style="color:#669933;">();</span><br><span style="color:#336699;">?></span><br><br> b.php<br><span style="color:#336699;"><?php</span><br><span style="color:#669933;">return;<br><br> function </span><span style="color:#336699;">foo</span><span style="color:#669933;">() {<br> echo </span><span style="color:#cc3333;">'foo'</span><span style="color:#669933;">;<br> }</span><br><span style="color:#336699;">?></span><br><br> Executing a.php will output "foo".</span></code></span>
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