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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>Strip whitespace (or other characters) from the end of a 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.quotemeta.html">quotemeta</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.setlocale.html">setlocale</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.rtrim" class="refentry"> <div class="refnamediv"> <h1 class="refname">rtrim</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">rtrim</span> — <span class="dc-title">Strip whitespace (or other characters) from the end of a 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>rtrim</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$str</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$charlist</tt></span> ] )</div> <p class="para rdfs-comment"> This function returns a string with whitespace stripped from the end of <i><tt class="parameter">str</tt></i>. </p> <p class="para"> Without the second parameter, <b>rtrim()</b> will strip these characters: <ul class="itemizedlist"> <li class="listitem"> <span class="simpara"> " " (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <i>32</i> (<i>0x20</i>)), an ordinary space. </span> </li> <li class="listitem"> <span class="simpara"> "\t" (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <i>9</i> (<i>0x09</i>)), a tab. </span> </li> <li class="listitem"> <span class="simpara"> "\n" (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <i>10</i> (<i>0x0A</i>)), a new line (line feed). </span> </li> <li class="listitem"> <span class="simpara"> "\r" (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <i>13</i> (<i>0x0D</i>)), a carriage return. </span> </li> <li class="listitem"> <span class="simpara"> "\0" (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <i>0</i> (<i>0x00</i>)), the <i>NUL</i>-byte. </span> </li> <li class="listitem"> <span class="simpara"> "\x0B" (<acronym title="American Standard Code for Information Interchange">ASCII</acronym> <i>11</i> (<i>0x0B</i>)), a vertical tab. </span> </li> </ul> </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">str</tt></i></span> <dd> <p class="para"> The input string. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">charlist</tt></i></span> <dd> <p class="para"> You can also specify the characters you want to strip, by means of the <i><tt class="parameter">charlist</tt></i> parameter. Simply list all characters that you want to be stripped. With <i>..</i> you can specify a range of characters. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the modified string. </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.1.0</td> <td colspan="1" rowspan="1" align="left"> The <i><tt class="parameter">charlist</tt></i> parameter was added. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 Usage example of <b>rtrim()</b></b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br />$text </span><span style="color: #007700">= </span><span style="color: #DD0000">"\t\tThese are a few words :) ... "</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$binary </span><span style="color: #007700">= </span><span style="color: #DD0000">"\x09Example string\x0A"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$hello </span><span style="color: #007700">= </span><span style="color: #DD0000">"Hello World"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #0000BB">$binary</span><span style="color: #007700">, </span><span style="color: #0000BB">$hello</span><span style="color: #007700">);<br /><br />print </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$trimmed </span><span style="color: #007700">= </span><span style="color: #0000BB">rtrim</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$trimmed</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$trimmed </span><span style="color: #007700">= </span><span style="color: #0000BB">rtrim</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #DD0000">" \t."</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$trimmed</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$trimmed </span><span style="color: #007700">= </span><span style="color: #0000BB">rtrim</span><span style="color: #007700">(</span><span style="color: #0000BB">$hello</span><span style="color: #007700">, </span><span style="color: #DD0000">"Hdle"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$trimmed</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// trim the ASCII control characters at the end of $binary<br />// (from 0 to 31 inclusive)<br /></span><span style="color: #0000BB">$clean </span><span style="color: #007700">= </span><span style="color: #0000BB">rtrim</span><span style="color: #007700">(</span><span style="color: #0000BB">$binary</span><span style="color: #007700">, </span><span style="color: #DD0000">"\x00..\x1F"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$clean</span><span style="color: #007700">);<br /><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>string(32) " These are a few words :) ... "string(16) " Example string"string(11) "Hello World"string(30) " These are a few words :) ..."string(26) " These are a few words :)"string(9) "Hello Wor"string(15) " Example string"</pre></div> </pre></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.trim.html" class="function" rel="rdfs-seeAlso">trim()</a></li> <li class="member"><a href="function.ltrim.html" class="function" rel="rdfs-seeAlso">ltrim()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.quotemeta.html">quotemeta</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.setlocale.html">setlocale</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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