x
<html><body><p>The parameter "mode 4" will return a string with all the unused characters. In this example, the characters not used in "Hello World!" are:</p>$str = "Hello World!";echo count_chars($str,4); </body><!-- Mirrored from www.w3schools.com/php/phptryit.asp?filename=tryphp_func_string_count_chars2 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:22:58 GMT --></html>