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<?php //Filter out the bad words function blacklist_filter($post) { $list = 'example|' .'exampletwo|' .'examplethree'; return preg_replace_callback('/\b('.$list.')\b/i', function (array $match) { return str_repeat('*', strlen($match[1])); }, $post); } echo blacklist_filter("xy EXAMPLE xy");

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