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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>Get the type of a variable</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.get-resource-type.html">get_resource_type</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.import-request-variables.html">import_request_variables</a></div> <div class="up"><a href="ref.var.html">Variable handling Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.gettype" class="refentry"> <div class="refnamediv"> <h1 class="refname">gettype</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">gettype</span> — <span class="dc-title">Get the type of a variable</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>gettype</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">$var</tt></span> )</div> <p class="para rdfs-comment"> Returns the type of the PHP variable <i><tt class="parameter">var</tt></i>. </p> <div class="warning"><b class="warning">Warning</b> <p class="simpara"> Never use <b>gettype()</b> to test for a certain type, since the returned string may be subject to change in a future version. In addition, it is slow too, as it involves string comparison. </p> <p class="simpara"> Instead, use the <i>is_*</i> functions. </p> </div> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">var</tt></i></span> <dd> <p class="para"> The variable being type checked. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Possibles values for the returned string are: <ul class="itemizedlist"> <li class="listitem"> <span class="simpara"> "<a href="language.types.boolean.html" class="type boolean">boolean</a>" </span> </li> <li class="listitem"> <span class="simpara"> "<a href="language.types.integer.html" class="type integer">integer</a>" </span> </li> <li class="listitem"> <span class="simpara"> "<a href="language.types.float.html" class="type double">double</a>" (for historical reasons "double" is returned in case of a <a href="language.types.float.html" class="type float">float</a>, and not simply "float") </span> </li> <li class="listitem"> <span class="simpara"> "<a href="language.types.string.html" class="type string">string</a>" </span> </li> <li class="listitem"> <span class="simpara"> "<a href="language.types.array.html" class="type array">array</a>" </span> </li> <li class="listitem"> <span class="simpara"> "<a href="language.types.object.html" class="type object">object</a>" </span> </li> <li class="listitem"> <span class="simpara"> "<a href="language.types.resource.html" class="type resource">resource</a>" </span> </li> <li class="listitem"> <span class="simpara"> "<a href="language.types.null.html" class="type NULL">NULL</a>" </span> </li> <li class="listitem"> <span class="simpara"> "unknown type" </span> </li> </ul> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.settype.html" class="function" rel="rdfs-seeAlso">settype()</a></li> <li class="member"><a href="function.is-array.html" class="function" rel="rdfs-seeAlso">is_array()</a></li> <li class="member"><a href="function.is-bool.html" class="function" rel="rdfs-seeAlso">is_bool()</a></li> <li class="member"><a href="function.is-float.html" class="function" rel="rdfs-seeAlso">is_float()</a></li> <li class="member"><a href="function.is-int.html" class="function" rel="rdfs-seeAlso">is_int()</a></li> <li class="member"><a href="function.is-null.html" class="function" rel="rdfs-seeAlso">is_null()</a></li> <li class="member"><a href="function.is-numeric.html" class="function" rel="rdfs-seeAlso">is_numeric()</a></li> <li class="member"><a href="function.is-object.html" class="function" rel="rdfs-seeAlso">is_object()</a></li> <li class="member"><a href="function.is-resource.html" class="function" rel="rdfs-seeAlso">is_resource()</a></li> <li class="member"><a href="function.is-scalar.html" class="function" rel="rdfs-seeAlso">is_scalar()</a></li> <li class="member"><a href="function.is-string.html" class="function" rel="rdfs-seeAlso">is_string()</a></li> <li class="member"><a href="function.function-exists.html" class="function" rel="rdfs-seeAlso">function_exists()</a></li> <li class="member"><a href="function.method-exists.html" class="function" rel="rdfs-seeAlso">method_exists()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.get-resource-type.html">get_resource_type</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.import-request-variables.html">import_request_variables</a></div> <div class="up"><a href="ref.var.html">Variable handling 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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