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<!DOCTYPE html>
<html>
<body>
​
<p>The parameter "mode 3" will return a string with all the different characters used. In this example, the characters used in "Hello World!" are:</p>
​
<?php
$str = "Hello World!";
echo count_chars($str,3);
?> 
​
</body>
</html>
​

The parameter "mode 3" will return a string with all the different characters used. In this example, the characters used in "Hello World!" are:

!HWdelor