mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-18 05:26:57 +08:00
175 lines
6.3 KiB
HTML
175 lines
6.3 KiB
HTML
<!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>Generates cryptographically secure pseudo-random integers</title>
|
|
</head>
|
|
<body class="docs"><div id="layout">
|
|
<div id="layout-content"><div id="function.random-int" class="refentry">
|
|
<div class="refnamediv">
|
|
<h1 class="refname">random_int</h1>
|
|
<p class="verinfo">(PHP 7)</p><p class="refpurpose"><span class="refname">random_int</span> — <span class="dc-title">Generates cryptographically secure pseudo-random integers</span></p>
|
|
|
|
</div>
|
|
|
|
<div class="refsect1 description" id="refsect1-function.random-int-description">
|
|
<h3 class="title">说明</h3>
|
|
<div class="methodsynopsis dc-description">
|
|
<span class="methodname"><strong>random_int</strong></span>
|
|
( <span class="methodparam"><span class="type">int</span> <code class="parameter">$min</code></span>
|
|
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$max</code></span>
|
|
) : <span class="type">int</span></div>
|
|
|
|
<p class="para rdfs-comment">
|
|
Generates cryptographic random integers that are suitable for use where
|
|
unbiased results are critical, such as when shuffling a deck of cards for a
|
|
poker game.
|
|
</p>
|
|
|
|
<p class="para">
|
|
The sources of randomness used for this function are as follows:
|
|
</p>
|
|
<ul class="itemizedlist">
|
|
<li class="listitem">
|
|
<span class="simpara">
|
|
On Windows,
|
|
<a href="https://msdn.microsoft.com/en-us/library/windows/desktop/aa379942(v=vs.85).aspx" class="link external">» <span class="function"><strong>CryptGenRandom()</strong></span></a>
|
|
will always be used. As of PHP 7.2.0, the
|
|
<a href="https://docs.microsoft.com/en-us/windows/desktop/SecCNG/cng-portal" class="link external">» CNG-API</a>
|
|
will always be used instead.
|
|
</span>
|
|
</li>
|
|
<li class="listitem">
|
|
<span class="simpara">
|
|
On Linux, the
|
|
<a href="http://man7.org/linux/man_pages/man2/getrandom.2.html" class="link external">» getrandom(2)</a>
|
|
syscall will be used if available.
|
|
</span>
|
|
</li>
|
|
<li class="listitem">
|
|
<span class="simpara">
|
|
On other platforms, <var class="filename">/dev/urandom</var> will be used.
|
|
</span>
|
|
</li>
|
|
<li class="listitem">
|
|
<span class="simpara">
|
|
If none of the aforementioned sources are available, then an
|
|
<a href="class.exception.html" class="classname">Exception</a> will be thrown.
|
|
</span>
|
|
</li>
|
|
</ul>
|
|
|
|
|
|
<blockquote class="note"><p><strong class="note">Note</strong>:
|
|
<span class="simpara">
|
|
Although this function was added to PHP in PHP 7.0, a
|
|
<a href="https://github.com/paragonie/random_compat" class="link external">» userland implementation</a>
|
|
is available for PHP 5.2 to 5.6, inclusive.
|
|
</span>
|
|
</p></blockquote>
|
|
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 parameters" id="refsect1-function.random-int-parameters">
|
|
<h3 class="title">参数</h3>
|
|
<dl>
|
|
|
|
|
|
<dt>
|
|
<code class="parameter">min</code></dt>
|
|
|
|
<dd>
|
|
|
|
<p class="para">
|
|
The lowest value to be returned, which must be
|
|
<strong><code>PHP_INT_MIN</code></strong> or higher.
|
|
</p>
|
|
</dd>
|
|
|
|
|
|
|
|
<dt>
|
|
<code class="parameter">max</code></dt>
|
|
|
|
<dd>
|
|
|
|
<p class="para">
|
|
The highest value to be returned, which must be less than or equal to
|
|
<strong><code>PHP_INT_MAX</code></strong>.
|
|
</p>
|
|
</dd>
|
|
|
|
|
|
</dl>
|
|
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 returnvalues" id="refsect1-function.random-int-returnvalues">
|
|
<h3 class="title">返回值</h3>
|
|
<p class="para">
|
|
Returns a cryptographically secure random integer in the range
|
|
<code class="parameter">min</code> to <code class="parameter">max</code>, inclusive.
|
|
</p>
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 errors" id="refsect1-function.random-int-errors">
|
|
<h3 class="title">错误／异常</h3>
|
|
<ul class="itemizedlist">
|
|
|
|
<li class="listitem">
|
|
<span class="simpara">
|
|
If an appropriate source of randomness cannot be found,
|
|
an <a href="class.exception.html" class="classname">Exception</a> will be thrown.
|
|
</span>
|
|
</li>
|
|
<li class="listitem">
|
|
<span class="simpara">
|
|
If invalid parameters are given, a <strong class="classname">TypeError</strong>
|
|
will be thrown.
|
|
</span>
|
|
</li>
|
|
|
|
<li class="listitem">
|
|
<span class="simpara">
|
|
If <code class="parameter">max</code> is less than <code class="parameter">min</code>, an
|
|
<strong class="classname">Error</strong> will be thrown.
|
|
</span>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 examples" id="refsect1-function.random-int-examples">
|
|
<h3 class="title">范例</h3>
|
|
<div class="example" id="example-887">
|
|
<p><strong>Example #1 <span class="function"><strong>random_int()</strong></span> example</strong></p>
|
|
<div class="example-contents">
|
|
<div class="phpcode"><pre><span style="color: #000000">
|
|
<span style="color: #0000BB"><?php<br />var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">random_int</span><span style="color: #007700">(</span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">999</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">random_int</span><span style="color: #007700">(-</span><span style="color: #0000BB">1000</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">?></span>
|
|
</span>
|
|
</pre></div>
|
|
</div>
|
|
|
|
<div class="example-contents"><p>以上例程的输出类似于：</p></div>
|
|
<div class="example-contents screen">
|
|
<div class="cdata"><pre>
|
|
int(248)
|
|
int(-898)
|
|
</pre></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 seealso" id="refsect1-function.random-int-seealso">
|
|
<h3 class="title">参见</h3>
|
|
<ul class="simplelist">
|
|
<li class="member"><span class="function"><a href="random_bytes.html" class="function" rel="rdfs-seeAlso">random_bytes()</a> - Generates cryptographically secure pseudo-random bytes</span></li>
|
|
</ul>
|
|
</div>
|
|
|
|
|
|
</div></div></div></body></html> |