PHP/String/strcspn

See what portion of a string is composed only of a given set of characters

<?
$twister = "Peter Piper picked a peck of pickled peppers";
$charset = "Peter picked a";
print("The segment matching "$charset" is " . strspn($twister, $charset) . " characters long");
?>

strcspn($password, "1234567890")

<?php
   $password = "a12345";
   if (strcspn($password, "1234567890") == 0) {
      print "Password cannot consist solely of numbers! ";
   }
?>

strspn: Find length of initial segment matching mask

<?php
   $password = "3312345";
   if (strspn($password, "1234567890") == strlen($password))
      echo "The password cannot consist solely of numbers!";
?>