[php-src] Issue #12261: is_no_input

Issue: https://github.com/php/php-src/issues/12261 Author: AlessandroRosa ### Description This function checks whether the input variable actually exists or includes something: PHP provides a set of functions "is_null", "is_set", "empty" ... that accomplish different tasks or are ambiguous, like "empty" returning false when the input variable is set to 0. No such feature looks like being available yet, to me. function is_no_input( $input = null ) { return is_null( $input ) || !isset( $input ) || strlen( trim( "$input" ) ) == 0 ? 1 : 0; }