随机字母数字针？

Question

我正在为脚本创建一个随机的5个字符的引脚。我想知道是否有其他人有更好的？

$pin = '';
while($i != 5){
    $string = '23456789abcdefghjkmnprstvwxyzABCDEFGHJKLMNPRSTVWXYZ'; 
    $pos = rand(0,(strlen($string)-1));
    $pin = $pin . $string[$pos];
    $i++;
}

echo $pin;

Answer 1

略有不同/更短。没有理由每次都声明有效字符，并且for循环通常被认为是优于while。

$pinlength = 5;
$charSet = '23456789abcdefghjkmnprstvwxyzABCDEFGHJKLMNPRSTVWXYZ'; 
$pin = '';
for($a = 0; $a < $pinlength; $a++) $pin .= $charSet[rand(0, strlen($charSet))];

echo $pin;

或者，只是为了它的地狱：

$makeCharacterSelect = 
         function ($charSet) {return function use ($charSet) 
                                     {return $charSet[rand(0, strlen($charSet))];};
$pinlength = 5; $c = $makeCharacterSelect('23456789abcdefghjkmnprstvwxyzABCDEFGHJKLMNPRSTVWXYZ');

$pin = '';
for($a = 0; $a < $pinlength; $a++) $pin .= $c();

Answer 2

$pin = substr(uniqid(), 0, 5); // Mind you, this doesn't contain
                               // upper-case letters