PHP declaring empty arrays?

I have to make a two-dimensional array based on the number of lets say car parts that is submitted on a form. Is it possible to declare an array of a ce开发者_高级运维rtain size and THEN go back and fill it?

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PHP arrays are dynamically allocated. There's no reason to create it ahead of time. Just start using the indexes as you need them:

$myNewVar[0] = 'data';

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You could use array_fill() for that:

$array = array_fill(1, 50, "");   // creates [1]...[50] with "" string