PHP generates a code that randomly generates a six-digit password

//Randomly generate a six-digit password Begin
function randStr($len=6,$format='ALL') {
 switch($format) {
 case 'ALL':
 $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-@#~'; break;
 case 'CHAR':
 $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-@#~'; break;
 case 'N UMBER':
 $chars='0123456789'; break;
 default :
 $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-@#~';
 break;
 }
 mt_srand((double)microtime()*1000000*getmypid());
 $password="";
 while(strlen($password )<$len)
 $password.=substr($chars,(mt_rand()%strlen($chars)),1);
 return $password;
 }
 //Randomly generate a six-digit passwordEnd
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