in Operator

Hello, I'd like to propose a new feature to PHP: The in Operator Bob mentioned a few weeks ago he wants such an operator in PHP and today I stumbled over http://nikic.github.io/2012/07/27/How-to-add-new-syntactic-features-to-PHP.html again, which uses the in operator as a sample. Use cases: $obj = new StdClass; $obj->prop = "value"; $languages = ["PHP", "C", "Java"]; var_dump("PHP" in $languages); // true var_dump("Python" in $languages); // false var_dump(0 in $languages); // false var_dump("0x0" in ["0e3"]); // false var_dump("prop" in $obj); // true var_dump("foo" in $obj); // false var_dump("Hello" in "Hello World!"); // true For strings, it would replace strpos("Hello World!", "Hello") !== false), for arrays it would replace in_array($needle, $haystack, true) and for objects it would be a replacement of property_exists($class, $property)`. This change would mainly be syntax sugar, but I think it's worth because: * "0x0" in ["0e3"] would return false while in_array("0x0", ["0e3"]) returns true, that's probably an edge case, but there may be a lot of people that don't use the $strict parameter, see http://3v4l.org/0K7E5 * It would solve the issue that it's hard to remember the order of the arguments for in_array and strpos, just had to look it up again. Bob would volunteer to implement that feature. Best Regards Niklas Keller