<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Show largest possible random value</title>
</head>
<body><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.min.html">min</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.mt-rand.html">mt_rand</a></div>
<div class="up"><a href="ref.math.html">Math Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div><hr /><div id="function.mt-getrandmax" class="refentry">
<div class="refnamediv">
<h1 class="refname">mt_getrandmax</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mt_getrandmax</span> — <span class="dc-title">Show largest possible random value</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.mt-getrandmax-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>mt_getrandmax</strong></span>
( <span class="methodparam">void</span>
)</div>
<p class="simpara">
Returns the maximum value that can be returned by a call to
<span class="function"><a href="function.mt-rand.html" class="function">mt_rand()</a></span>.
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.mt-getrandmax-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns the maximum random value returned by <span class="function"><a href="function.mt-rand.html" class="function">mt_rand()</a></span>
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.mt-getrandmax-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-3466"><p><strong>Example #1 Calculate a random floating-point number</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">randomFloat</span><span style="color: #007700">(</span><span style="color: #0000BB">$min </span><span style="color: #007700">= </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">$max </span><span style="color: #007700">= </span><span style="color: #0000BB">1</span><span style="color: #007700">) {<br /> return </span><span style="color: #0000BB">$min </span><span style="color: #007700">+ </span><span style="color: #0000BB">mt_rand</span><span style="color: #007700">() / </span><span style="color: #0000BB">mt_getrandmax</span><span style="color: #007700">() * (</span><span style="color: #0000BB">$max </span><span style="color: #007700">- </span><span style="color: #0000BB">$min</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">randomFloat</span><span style="color: #007700">());<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">randomFloat</span><span style="color: #007700">(</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">20</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 screen">
<div class="cdata"><pre>
float(0.91601131712832)
float(16.511210331931)
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.mt-getrandmax-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.mt-rand.html" class="function" rel="rdfs-seeAlso">mt_rand()</a> - Generate a better random value</span></li>
<li class="member"> <span class="function"><a href="function.mt-srand.html" class="function" rel="rdfs-seeAlso">mt_srand()</a> - Seed the better random number generator</span></li>
<li class="member"> <span class="function"><a href="function.getrandmax.html" class="function" rel="rdfs-seeAlso">getrandmax()</a> - Show largest possible random value</span></li>
</ul>
</p>
</div>
</div><hr /><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.min.html">min</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.mt-rand.html">mt_rand</a></div>
<div class="up"><a href="ref.math.html">Math Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div></body></html>
