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PHP随机获得字符代码

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Release: 2016-06-13 11:34:41
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//获取随机字符 此函数区分字符大小写 如果不区分大小写可加入函数strtolower
function genRandomString($len)
{
    $chars = array(
        "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",  
        "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",  
        "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G",  
        "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",  
        "S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2",  
        "3", "4", "5", "6", "7", "8", "9"
    );
    $charsLen = count($chars) - 1;
    shuffle($chars);// 将数组打乱
    $output = "";
    for ($i=0; $i     {
        $output .= $chars[mt_rand(0, $charsLen)]; //获得一个数组元素
    }  
    return $output;
}
$str = genRandomString(4);
echo $str;
?>
  
 

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