php生成随机密码的方法

[php]代码库

<code class="php" style="margin:0px; padding:0px; border:0px; font-size:10px; vertical-align:baseline; font-family:Monaco,Menlo,Consolas,'Courier New',monospace; color:inherit; background-color:transparent"> 
<span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">function</span> generate_password( <span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">$</span><span class="php__variable" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:rgb(64,64,194)">length</span> = <span class="php__number" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:red">8</span> ) { 
    <span class="php__com" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:green">// 密码字符集，可任意添加你需要的字符</span> 
    <span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">$</span><span class="php__variable" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:rgb(64,64,194)">chars</span> = <span class="php__string1" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:purple">'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789  !@#$%^&*()-_ []{}<>~`+=,.;:/?|'</span>; 
    <span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">$</span><span class="php__variable" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:rgb(64,64,194)">password</span> = <span class="php__string1" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:purple">''</span>; 
    <span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">for</span> ( <span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">$</span><span class="php__variable" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:rgb(64,64,194)">i</span> = <span class="php__number" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:red">0</span>; <span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">$</span><span class="php__variable" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:rgb(64,64,194)">i</span> < <span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">$</span><span class="php__variable" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:rgb(64,64,194)">length</span>; <span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">$</span><span class="php__variable" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:rgb(64,64,194)">i</span>++ ){ 
        <span class="php__com" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:green">// 这里提供两种字符获取方式</span> 
        <span class="php__com" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:green">// 第一种是使用 substr 截取$chars中的任意一位字符；</span> 
        <span class="php__com" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:green">// 第二种是取字符数组 $chars 的任意元素</span> 
        <span class="php__com" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:green">// $password .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);</span> 
        <span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">$</span><span class="php__variable" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:rgb(64,64,194)">password</span> .= <span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">$</span><span class="php__variable" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:rgb(64,64,194)">chars</span>[ mt_rand(<span class="php__number" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:red">0</span>, strlen(<span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">$</span><span class="php__variable" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:rgb(64,64,194)">chars</span>) - <span class="php__number" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:red">1</span>) ]; 
    } 
    <span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">return</span> <span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">$</span><span class="php__variable" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:rgb(64,64,194)">password</span>; 
} 
<span class="php__keyword" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; font-weight:bold; color:navy">echo</span> generate_password(<span class="php__number" style="margin:0px; padding:0px; border:0px; vertical-align:baseline; color:red">6</span>); 
</code>