function.filter-var.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>Filters a variable with a specified filter</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="ref.filter.html">Filter Functions</a></div> <div class="next" style="text-align: right; float: right;"><a href="book.funchand.html">Function Handling</a></div> <div class="up"><a href="ref.filter.html">Filter Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.filter-var" class="refentry"> <div class="refnamediv"> <h1 class="refname">filter_var</h1> <p class="verinfo">(PHP 5 >= 5.2.0, PECL filter:0.11.0)</p><p class="refpurpose"><span class="refname">filter_var</span> — <span class="dc-title">Filters a variable with a specified filter</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <span class="methodname"><b><b>filter_var</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">$variable</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$filter</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">$options</tt></span> ]] )</div> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">variable</tt></i></span> <dd> <p class="para"> Value to filter. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">filter</tt></i></span> <dd> <p class="para"> ID of a filter to use. Defaults to <b><tt>FILTER_SANITIZE_STRING</tt></b>. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">options</tt></i></span> <dd> <p class="para"> Associative array of options or bitwise disjunction of flags. If filter accepts options, flags can be provided in "flags" field of array. For the "callback" filter, <a href="language.pseudo-types.html#language.types.callback" class="type callback">callback</a> type should be passed. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the filtered data, or <b><tt>FALSE</tt></b> if the filter fails. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 A <b>filter_var()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #DD0000">'bob@example.com'</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_VALIDATE_EMAIL</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">filter_var</span><span style="color: #007700">(</span><span style="color: #DD0000">'example.com'</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_VALIDATE_URL</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_FLAG_SCHEME_REQUIRED</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>string(15) "bob@example.com"bool(false)</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.filter-var-array.html" class="function" rel="rdfs-seeAlso">filter_var_array()</a></li> <li class="member"><a href="function.filter-input.html" class="function" rel="rdfs-seeAlso">filter_input()</a></li> <li class="member"><a href="function.filter-input-array.html" class="function" rel="rdfs-seeAlso">filter_input_array()</a></li> <li class="member">information about the <a href="language.pseudo-types.html#language.types.callback" class="link">callback</a> type</li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="ref.filter.html">Filter Functions</a></div> <div class="next" style="text-align: right; float: right;"><a href="book.funchand.html">Function Handling</a></div> <div class="up"><a href="ref.filter.html">Filter 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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