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Hence, $varname should be a mixed value of var's to check for, and $parent can be an array or object, which will default to the GLOBAL scope.
See the documentation of array_key_exists for further information.
To achieve it you can use "isset" like this: isset($array['key1'], $array['key2'], $array['key3'], $array['key4'])You have to write $array all times and it is reiterative if you use same array each time.
I, too, was dismayed to find that isset($foo) returns false if ($foo == null).And if you have any E_NOTICE errors caused by other code between the set_error_handler and restore_error_handler they will not be dealt with properly.One solution: Outputs: True False Notice: Undefined variable: j in on line 26This will make the handler only handle var_exists, but it adds a lot of overhead.Hence, it doesn't work how you'd think it would, (as documented) a var currently in the scope with a null value will return false.
Heres a quick solution, perhaps there are better ways of going about this, but heres my solution...
It appears that just setting the var to null doesn't do the trick. I checked the fields in both WS and they are identical.