PHP/String/count chars

count_chars.php

 
<?php
   $sentence = "this is a test";
   $chart = count_chars($sentence, 1); 
   foreach($chart as $letter=>$frequency)
      echo "Character ".chr($letter)." appears $frequency times<br />";
?>

mixed count_chars ( string str [, int mode] ) returns an array containing the letters used in that string and how many times each letter was used.

 
<?
    $str = "This is a test, only a test, and nothing but a test.";
    $a = count_chars($str, 1);
    print_r($a);
?>