PHP生成随机字符串

PHP生成随机字符串的函数，下面是我在网上找到的2个关于PHP随机字符串的函数，希望大家喜欢。

< ?php
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<len; i++)
{
output .= chars[mt_rand(0, charsLen)];
}

return output;

}

str = genRandomString(25);
str .= “<br />”;
str .= genRandomString(25);
str .= “<br />”;
str .= genRandomString(25);

echo str;

?>

<?php
/* Generate Password
* Length : 8
*/
str = “0123456789abcdefghijklmnopqrstuvwxyz”; // 输出字符集
n = 8; // 输出串长度
len = strlen(str)-1;
for(j=0 ; j<200 ; j++){
for(i=0 ; i<n; i++){
s .= str[rand(0,len)];
}
echo s . “<br/>”;
s = “”;
}

?>