PHP 函数 ctype_print()

<?php
   $strings = array('asdf\n\r\t', 'k211', "fooo#int%@");

   foreach ($strings as $test) {
      if (ctype_print($test)) {
         echo "$test consists of all printable characters. \n";
      }else {
         echo "$test does not have all printable characters. \n";
      }
   }
?>