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PHP

When is an array not an array?

I'm currently looking at nested arrays in PHP and I understand how they work to an extent, what I can't see is how PHP knows an array is nested. In most languages this kind of functionality is indicated by some sort of enclosure or similar but in PHP this isn't the case. It just seems to be assumed that an empty array will contain any further arrays below it. I'm asking mainly as I'm trying to understand how you would manage a large number of nested arrays, say for a database. Do they have to be in a single code block?