$Key = "xyz";
lots more code here.
if($key == "xyz"){
Notice: Undefined variable: key in \path\to\test.php on line X
do this stuff; } lots more code here;
If the language forces variable deceleration you simply get an error "variable $key not defined on line x" then there is no searching no wondering, you immediately know you made a typo, and you know exactly what line it is on.
Like that, you mean? error_reporting(E_ALL) does that for you. Of course you then turn it down when your code goes into production, though.
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