📄 function.str-pad.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>Pad a string to a certain length with another string</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.str-ireplace.html">str_ireplace</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.str-repeat.html">str_repeat</a></div> <div class="up"><a href="ref.strings.html">String Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.str-pad" class="refentry"> <div class="refnamediv"> <h1 class="refname">str_pad</h1> <p class="verinfo">(PHP 4 >= 4.0.1, PHP 5)</p><p class="refpurpose"><span class="refname">str_pad</span> — <span class="dc-title">Pad a string to a certain length with another string</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>str_pad</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$input</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$pad_length</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$pad_string</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$pad_type</tt></span> ]] )</div> <p class="para rdfs-comment"> This functions returns the <i><tt class="parameter">input</tt></i> string padded on the left, the right, or both sides to the specified padding length. If the optional argument <i><tt class="parameter">pad_string</tt></i> is not supplied, the <i><tt class="parameter">input</tt></i> is padded with spaces, otherwise it is padded with characters from <i><tt class="parameter">pad_string</tt></i> up to the limit. </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"> The input string. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">pad_length</tt></i></span> <dd> <p class="para"> If the value of <i><tt class="parameter">pad_length</tt></i> is negative or less than the length of the input string, no padding takes place. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">pad_string</tt></i></span> <dd> <blockquote><p><b class="note">Note</b>: The <i><tt class="parameter">pad_string</tt></i> may be truncated if the required number of padding characters can't be evenly divided by the <i><tt class="parameter">pad_string</tt></i>'s length. <br /> </p></blockquote> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">pad_type</tt></i></span> <dd> <p class="para"> Optional argument <i><tt class="parameter">pad_type</tt></i> can be <b><tt>STR_PAD_RIGHT</tt></b>, <b><tt>STR_PAD_LEFT</tt></b>, or <b><tt>STR_PAD_BOTH</tt></b>. If <i><tt class="parameter">pad_type</tt></i> is not specified it is assumed to be <b><tt>STR_PAD_RIGHT</tt></b>. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the padded string. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>str_pad()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$input </span><span style="color: #007700">= </span><span style="color: #DD0000">"Alien"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">str_pad</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">); </span><span style="color: #FF8000">// produces "Alien "<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">str_pad</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">, </span><span style="color: #DD0000">"-="</span><span style="color: #007700">, </span><span style="color: #0000BB">STR_PAD_LEFT</span><span style="color: #007700">); </span><span style="color: #FF8000">// produces "-=-=-Alien"<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">str_pad</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">, </span><span style="color: #DD0000">"_"</span><span style="color: #007700">, </span><span style="color: #0000BB">STR_PAD_BOTH</span><span style="color: #007700">); </span><span style="color: #FF8000">// produces "__Alien___"<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">str_pad</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">6 </span><span style="color: #007700">, </span><span style="color: #DD0000">"___"</span><span style="color: #007700">); </span><span style="color: #FF8000">// produces "Alien_"<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.str-ireplace.html">str_ireplace</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.str-repeat.html">str_repeat</a></div> <div class="up"><a href="ref.strings.html">String 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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