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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>Multiplies the values of the two variants</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.variant-mod.html">variant_mod</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.variant-neg.html">variant_neg</a></div> <div class="up"><a href="ref.com.html">COM Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.variant-mul" class="refentry"> <div class="refnamediv"> <h1 class="refname">variant_mul</h1> <p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">variant_mul</span> — <span class="dc-title">Multiplies the values of the two variants</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>variant_mul</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">$left</tt></span> , <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$right</tt></span> )</div> <p class="para rdfs-comment"> Multiplies <i><tt class="parameter">left</tt></i> by <i><tt class="parameter">right</tt></i>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">left</tt></i></span> <dd> <p class="para"> The left operand. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">right</tt></i></span> <dd> <p class="para"> The right operand. </p> </dd> </dt> </dl> Boolean values are converted to -1 for <b><tt>FALSE</tt></b> and 0 for <b><tt>TRUE</tt></b>. <blockquote><p><b class="note">Note</b>: As with all the variant arithmetic functions, the parameters for this function can be either a PHP native type (integer, string, floating point, boolean or <b><tt>NULL</tt></b>), or an instance of a COM, VARIANT or DOTNET class. PHP native types will be converted to variants using the same rules as found in the constructor for the <a href="class.variant.html" class="xref">VARIANT</a> class. COM and DOTNET objects will have the value of their default property taken and used as the variant value.<br /> The variant arithmetic functions are wrappers around the similarly named functions in the COM library; for more information on these functions, consult the MSDN library. The PHP functions are named slightly differently; for example <a href="function.variant-add.html" class="function">variant_add()</a> in PHP corresponds to <i>VarAdd() </i> in the MSDN documentation.<br /></p></blockquote> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <table border="5"> <caption><b>Variant Multiplication Rules</b></caption> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">If</th> <th colspan="1">Then</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Both expressions are of the string, date, character, boolean type</td> <td colspan="1" rowspan="1" align="left">Multiplication</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">One expression is a string type and the other a character</td> <td colspan="1" rowspan="1" align="left">Multiplication</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">One expression is numeric and the other is a string</td> <td colspan="1" rowspan="1" align="left">Multiplication</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Both expressions are numeric</td> <td colspan="1" rowspan="1" align="left">Multiplication</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Either expression is NULL</td> <td colspan="1" rowspan="1" align="left">NULL is returned</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Both expressions are empty</td> <td colspan="1" rowspan="1" align="left">Empty string is returned</td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.variant-div.html" class="function" rel="rdfs-seeAlso">variant_div()</a></li> <li class="member"><a href="function.variant-idiv.html" class="function" rel="rdfs-seeAlso">variant_idiv()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.variant-mod.html">variant_mod</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.variant-neg.html">variant_neg</a></div> <div class="up"><a href="ref.com.html">COM 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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