Hey everyone.  I have an array that looks like this:

$main_array[0] = array('key1' => 'vala');
$main_array[1] = array('key1' => 'valb');

I want to sort the main array based on the value of key1 for each
sub-array.  I looked at all the array sorting functions, but unless I
misunderstood something, I didn't see a direct way to do what I want.

If there were a sorting function in which I could pass as an argument
the name of a function that compares two elements like qsort in C, I
could do it easily.  Is there a function like that in PHP?  If not, what
should I do?

Thanks everyone!

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