ctype_alnumОписаниеbool ctype_alnum ( string text )Checks if all of the characters in the provided string, text, are alphanumeric. In the standard C locale letters are just [A-Za-z] and the function is equivalent to preg_match('/^[a-z0-9]*$/i', $text). Возвращаемые значенияReturns TRUE if every character in text is either a letter or a digit, FALSE otherwise. Примеры
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