PHP randomly obtains character codes_PHP tutorial

//Get random characters. This function is case-sensitive. If it is not case-sensitive, you can add the function 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);//Shuffle the array
$output = "";
for ($i=0; $i<$len; $i++)
{
           $output .= $chars[mt_rand(0, $charsLen)]; //Get an array element
}  
Return $output;
}
$str = genRandomString(4);
echo $str;
?>

http://www.bkjia.com/PHPjc/371657.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/371657.htmlTechArticle?php //Get random characters. This function is case-sensitive. If it is not case-sensitive, you can add the function strtolower function genRandomString. ($len) { $chars = array( a, b, c, d, e, f, g, h,...