Arrays are a great way of storing variables that natural collect together, such as colours, days of the week, members of a team, or items in a shopping basket.
Multidimensional arrays allow you to store array within arrays to store very complex data in one convenient location.
Use the extract() function to pull all items out of an array and into the global scope, as it is faster and also easier to work with.
Cycle through your arrays using foreach() or similar means, as holes in your array can cause more simple loops to access empty values.
The var_dump() function is a great way to see what is inside your variables, whether they are arrays or not - make liberal use of it when debugging to save headaches!
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