Programming & Software Q&A | CollectiveSolver - Recent questions tagged php-string-unused-characters https://collectivesolver.com/tag/php-string-unused-characters Powered by Question2Answer How to use count_chars with mode 4 (string containing all unused characters is returned) in PHP https://collectivesolver.com/91682/how-to-use-count_chars-with-mode-4-string-containing-all-unused-characters-is-returned-in-php https://collectivesolver.com/91682/how-to-use-count_chars-with-mode-4-string-containing-all-unused-characters-is-returned-in-php Sun, 16 Nov 2025 06:37:40 +0000