functions.returning-values.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Returning values</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="functions.arguments.html">Function arguments</a></div> <div class="next" style="text-align: right; float: right;"><a href="functions.variable-functions.html">Variable functions</a></div> <div class="up"><a href="language.functions.html">Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="functions.returning-values" class="sect1"> <h2 class="title">Returning values</h2> <p class="para"> Values are returned by using the optional return statement. Any type may be returned, including arrays and objects. This causes the function to end its execution immediately and pass control back to the line from which it was called. See <b>return()</b> for more information. </p> <p class="para"> <div class="example"> <p><b>Example #1 Use of <b>return()</b></b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">square</span><span style="color: #007700">(</span><span style="color: #0000BB">$num</span><span style="color: #007700">)<br />{<br /> return </span><span style="color: #0000BB">$num </span><span style="color: #007700">* </span><span style="color: #0000BB">$num</span><span style="color: #007700">;<br />}<br />echo </span><span style="color: #0000BB">square</span><span style="color: #007700">(</span><span style="color: #0000BB">4</span><span style="color: #007700">); </span><span style="color: #FF8000">// outputs '16'.<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="para"> A function can not return multiple values, but similar results can be obtained by returning an array. </p> <p class="para"> <div class="example"> <p><b>Example #2 Returning an array to get multiple values</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">small_numbers</span><span style="color: #007700">()<br />{<br /> return array (</span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br />}<br />list (</span><span style="color: #0000BB">$zero</span><span style="color: #007700">, </span><span style="color: #0000BB">$one</span><span style="color: #007700">, </span><span style="color: #0000BB">$two</span><span style="color: #007700">) = </span><span style="color: #0000BB">small_numbers</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="para"> To return a reference from a function, use the reference operator & in both the function declaration and when assigning the returned value to a variable: </p> <p class="para"> <div class="example"> <p><b>Example #3 Returning a reference from a function</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function &</span><span style="color: #0000BB">returns_reference</span><span style="color: #007700">()<br />{<br /> return </span><span style="color: #0000BB">$someref</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$newref </span><span style="color: #007700">=& </span><span style="color: #0000BB">returns_reference</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="simpara"> For more information on references, please check out <a href="language.references.html" class="link">References Explained</a>. </p> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="functions.arguments.html">Function arguments</a></div> <div class="next" style="text-align: right; float: right;"><a href="functions.variable-functions.html">Variable functions</a></div> <div class="up"><a href="language.functions.html">Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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