📄 function.ctype-cntrl.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>Check for control character(s)</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.ctype-alpha.html">ctype_alpha</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.ctype-digit.html">ctype_digit</a></div> <div class="up"><a href="ref.ctype.html">Ctype Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.ctype-cntrl" class="refentry"> <div class="refnamediv"> <h1 class="refname">ctype_cntrl</h1> <p class="verinfo">(PHP 4 >= 4.0.4, PHP 5)</p><p class="refpurpose"><span class="refname">ctype_cntrl</span> — <span class="dc-title">Check for control character(s)</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>ctype_cntrl</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$text</tt></span> )</div> <p class="para rdfs-comment"> Checks if all of the characters in the provided string, <i><tt class="parameter">text</tt></i>, are control characters. Control characters are e.g. line feed, tab, escape. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">text</tt></i></span> <dd> <p class="para"> The tested string. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns <b><tt>TRUE</tt></b> if every character in <i><tt class="parameter">text</tt></i> is a control character from the current locale, <b><tt>FALSE</tt></b> otherwise. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 A <b>ctype_cntrl()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$strings </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'string1' </span><span style="color: #007700">=> </span><span style="color: #DD0000">"\n\r\t"</span><span style="color: #007700">, </span><span style="color: #DD0000">'string2' </span><span style="color: #007700">=> </span><span style="color: #DD0000">'arf12'</span><span style="color: #007700">);<br />foreach (</span><span style="color: #0000BB">$strings </span><span style="color: #007700">as </span><span style="color: #0000BB">$name </span><span style="color: #007700">=> </span><span style="color: #0000BB">$testcase</span><span style="color: #007700">) {<br /> if (</span><span style="color: #0000BB">ctype_cntrl</span><span style="color: #007700">(</span><span style="color: #0000BB">$testcase</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"The string '$name' consists of all control characters.\n"</span><span style="color: #007700">;<br /> } else {<br /> echo </span><span style="color: #DD0000">"The string '$name' does not consist of all control characters.\n"</span><span style="color: #007700">;<br /> }<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>The string 'string1' consists of all control characters.The string 'string2' does not consist of all control characters.</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.ctype-print.html" class="function" rel="rdfs-seeAlso">ctype_print()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.ctype-alpha.html">ctype_alpha</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.ctype-digit.html">ctype_digit</a></div> <div class="up"><a href="ref.ctype.html">Ctype 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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