01.function alphanumeric_rand($num_require=8) {
02. $alphanumeric = array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',0,1,2,3,4,5,6,7,8,9);
03. if($num_require > sizeof($alphanumeric)){
04. echo "Error alphanumeric_rand(\$num_require) : \$num_require must less than " . sizeof($alphanumeric) . ", $num_require given";
05. return;
06. }
07. $rand_key = array_rand($alphanumeric , $num_require);
08. for($i=0;$i<sizeof($rand_key);$i++) $randomstring .= $alphanumeric[$rand_key[$i]];
09. return $randomstring;
10.}
11.
12.echo alphanumeric_rand(12);
