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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>Pad array to the specified length with a value</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.array-multisort.html">array_multisort</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-pop.html">array_pop</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.array-pad" class="refentry"> <div class="refnamediv"> <h1 class="refname">array_pad</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">array_pad</span> — <span class="dc-title">Pad array to the specified length with a value</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>array_pad</b></b></span> ( <span class="methodparam"><span class="type">array</span> <tt class="parameter">$input</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$pad_size</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">$pad_value</tt></span> )</div> <p class="para rdfs-comment"> <b>array_pad()</b> returns a copy of the <i><tt class="parameter">input</tt></i> padded to size specified by <i><tt class="parameter">pad_size</tt></i> with value <i><tt class="parameter">pad_value</tt></i>. If <i><tt class="parameter">pad_size</tt></i> is positive then the array is padded on the right, if it's negative then on the left. If the absolute value of <i><tt class="parameter">pad_size</tt></i> is less than or equal to the length of the <i><tt class="parameter">input</tt></i> then no padding takes place. It is possible to add most 1048576 elements at a time. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">input</tt></i></span> <dd> <p class="para"> Initial array of values to pad. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">pad_size</tt></i></span> <dd> <p class="para"> New size of the array. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">pad_value</tt></i></span> <dd> <p class="para"> Value to pad if <i><tt class="parameter">input</tt></i> is less than <i><tt class="parameter">pad_size</tt></i>. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns a copy of the <i><tt class="parameter">input</tt></i> padded to size specified by <i><tt class="parameter">pad_size</tt></i> with value <i><tt class="parameter">pad_value</tt></i>. If <i><tt class="parameter">pad_size</tt></i> is positive then the array is padded on the right, if it's negative then on the left. If the absolute value of pad_size is less than or equal to the length of the input then no padding takes place. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>array_pad()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$input </span><span style="color: #007700">= array(</span><span style="color: #0000BB">12</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">, </span><span style="color: #0000BB">9</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_pad</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// result is array(12, 10, 9, 0, 0)<br /><br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_pad</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, -</span><span style="color: #0000BB">7</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// result is array(-1, -1, -1, -1, 12, 10, 9)<br /><br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_pad</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #DD0000">"noop"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// not padded<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.array-fill.html" class="function" rel="rdfs-seeAlso">array_fill()</a></li> <li class="member"><a href="function.range.html" class="function" rel="rdfs-seeAlso">range()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.array-multisort.html">array_multisort</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.array-pop.html">array_pop</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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