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<!DOCTYPE html> <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> <?php $str = "Hello World!"; echo count_chars($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], Mon, 27 Jan 2020 02:51:05 GMT --> </html>
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