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<title>Combined linear congruential generator</title>
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<h1 class="refname">lcg_value</h1>
<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">lcg_value</span> — <span class="dc-title">Combined linear congruential generator</span></p>
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<div class="refsect1 description" id="refsect1-function.lcg-value-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">float</span> <span class="methodname"><strong>lcg_value</strong></span>
( <span class="methodparam">void</span>
)</div>
<p class="para rdfs-comment">
<span class="function"><strong>lcg_value()</strong></span> returns a pseudo random number in
the range of (0, 1). The function combines two CGs with periods
of 2^31 - 85 and 2^31 - 249. The period of this function is equal
to the product of both primes.
</p>
<div class="caution"><strong class="caution">Caution</strong><p class="para">This function does not
generate cryptographically secure values, and should not be used for cryptographic purposes. If you need a
cryptographically secure value, consider using <span class="function"><a href="function.random-int.html" class="function">random_int()</a></span>, <span class="function"><a href="function.random-bytes.html" class="function">random_bytes()</a></span>, or
<span class="function"><a href="function.openssl-random-pseudo-bytes.html" class="function">openssl_random_pseudo_bytes()</a></span> instead.</p></div>
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<div class="refsect1 returnvalues" id="refsect1-function.lcg-value-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
A pseudo random float value between 0.0 and 1.0, inclusive.
</p>
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<div class="refsect1 seealso" id="refsect1-function.lcg-value-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"><span class="function"><a href="function.rand.html" class="function" rel="rdfs-seeAlso">rand()</a> - Generate a random integer</span></li>
<li class="member"><span class="function"><a href="function.mt-rand.html" class="function" rel="rdfs-seeAlso">mt_rand()</a> - Generate a random value via the Mersenne Twister Random Number Generator</span></li>
</ul>
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