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Leigh Maher20,340 Points
Creating the empty array
In this video Randy creates an empty array:
$product["sizes"] = array();
Can anyone explain exactly why this is necessary? I removed this line from my code and the project still works.
Davis Vilums18,105 Points
For this particular example everything worked fine, but in some cases you could need to define an array before, if you want to push or pull from it. If you haven't defined it, you can end up crushing your code, because variable is undefined.
Also It is better to predefine all variables before using them, so later it is easeier to read your code and see what kind of variables you have used.