function.compact.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>Create array containing variables and their 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="function.asort.html">asort</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.count.html">count</a></div> <div class="up"><a href="ref.array.html">Array Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.compact" class="refentry"> <div class="refnamediv"> <h1 class="refname">compact</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">compact</span> — <span class="dc-title">Create array containing variables and their values</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">array</span> <span class="methodname"><b><b>compact</b></b></span> ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$varname</tt></span> [, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$...</tt></span> ] )</div> <p class="para rdfs-comment"> Creates an array containing variables and their values. </p> <p class="para"> For each of these, <b>compact()</b> looks for a variable with that name in the current symbol table and adds it to the output array such that the variable name becomes the key and the contents of the variable become the value for that key. In short, it does the opposite of <a href="function.extract.html" class="function">extract()</a>. </p> <p class="para"> Any strings that are not set will simply be skipped. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">varname</tt></i></span> <dd> <p class="para"> <b>compact()</b> takes a variable number of parameters. Each parameter can be either a string containing the name of the variable, or an array of variable names. The array can contain other arrays of variable names inside it; <b>compact()</b> handles it recursively. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the output array with all the variables added to it. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>compact()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$city </span><span style="color: #007700">= </span><span style="color: #DD0000">"San Francisco"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$state </span><span style="color: #007700">= </span><span style="color: #DD0000">"CA"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$event </span><span style="color: #007700">= </span><span style="color: #DD0000">"SIGGRAPH"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$location_vars </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"city"</span><span style="color: #007700">, </span><span style="color: #DD0000">"state"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">compact</span><span style="color: #007700">(</span><span style="color: #DD0000">"event"</span><span style="color: #007700">, </span><span style="color: #DD0000">"nothing_here"</span><span style="color: #007700">, </span><span style="color: #0000BB">$location_vars</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>Array( [event] => SIGGRAPH [city] => San Francisco [state] => CA)</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: <b>Gotcha</b><br /> Because <a href="language.variables.variable.html" class="link">variable variables</a> may not be used with PHP's <a href="language.variables.superglobals.html" class="link">Superglobal arrays</a> within functions, the Superglobal arrays may not be passed into <b>compact()</b>. <br /> </p></blockquote> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.extract.html" class="function" rel="rdfs-seeAlso">extract()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.asort.html">asort</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.count.html">count</a></div> <div class="up"><a href="ref.array.html">Array 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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