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Suppose I have an array of arrays, and I want to sort the big array by the # of indexes in the sub-arrays, what would be the most efficient way to do that?

This is what I have so far

$sortorder = array_map('count', $largearray);
array_multisort($sortorder, $largearray);

Anything better than this?

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2 Answers 2

Reset to default
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usort($array, create_function('$a, $b', 'return bccomp(count($a), count($b));'));
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1 Comment

Thanks, one other thing-- is there a way to update this to make it ignore indexes without values when counting?
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Below is an answer that will work with PHP8+:

usort($array, function ($a, $b) { return sizeof($b) - sizeof($a); });
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1 Comment

thanks for sharing. I posted this question 14 years ago and still getting new stuff on it!

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