function.filter-input.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>Gets a specific external variable by name and optionally filters it</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.filter-input-array.html">filter_input_array</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.filter-list.html">filter_list</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-input" class="refentry"> <div class="refnamediv"> <h1 class="refname">filter_input</h1> <p class="verinfo">(PHP 5 >= 5.2.0, PECL filter:0.11.0)</p><p class="refpurpose"><span class="refname">filter_input</span> — <span class="dc-title">Gets a specific external variable by name and optionally filters it</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_input</b></b></span> ( <span class="methodparam"><span class="type">int</span> <tt class="parameter">$type</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$variable_name</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">type</tt></i></span> <dd> <p class="para"> One of <b><tt>INPUT_GET</tt></b>, <b><tt>INPUT_POST</tt></b>, <b><tt>INPUT_COOKIE</tt></b>, <b><tt>INPUT_SERVER</tt></b>, <b><tt>INPUT_ENV</tt></b>, <b><tt>INPUT_SESSION</tt></b> (not implemented yet) and <b><tt>INPUT_REQUEST</tt></b> (not implemented yet). </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">variable_name</tt></i></span> <dd> <p class="para"> Name of a variable to get. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">filter</tt></i></span> <dd> <p class="para"> Filter to apply. Defaults to <b><tt>FILTER_DEFAULT</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. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Value of the requested variable on success, <b><tt>FALSE</tt></b> if the filter fails, or <b><tt>NULL</tt></b> if the <i><tt class="parameter">variable_name</tt></i> variable is not set. If the flag <b><tt>FILTER_NULL_ON_FAILURE</tt></b> is used, it returns <b><tt>FALSE</tt></b> if the variable is not set and <b><tt>NULL</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_input()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$search_html </span><span style="color: #007700">= </span><span style="color: #0000BB">filter_input</span><span style="color: #007700">(</span><span style="color: #0000BB">INPUT_GET</span><span style="color: #007700">, </span><span style="color: #DD0000">'search'</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_SANITIZE_SPECIAL_CHARS</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$search_url </span><span style="color: #007700">= </span><span style="color: #0000BB">filter_input</span><span style="color: #007700">(</span><span style="color: #0000BB">INPUT_GET</span><span style="color: #007700">, </span><span style="color: #DD0000">'search'</span><span style="color: #007700">, </span><span style="color: #0000BB">FILTER_SANITIZE_ENCODED</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"You have searched for $search_html.\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">"<a href='?search=$search_url'>Search again.</a>"</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 something similar to:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>You have searched for Me &#38; son.<a href='?search=Me%20%26%20son'>Search again.</a></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.html" class="function" rel="rdfs-seeAlso">filter_var()</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"><a href="function.filter-var-array.html" class="function" rel="rdfs-seeAlso">filter_var_array()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.filter-input-array.html">filter_input_array</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.filter-list.html">filter_list</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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