(PHP 5 >= 5.2.0, PHP 7, PHP 8)
ArrayIterator::uasort — Sort with a user-defined comparison function and maintain index association
public ArrayIterator::uasort(callable $callback): bool
This method sorts the elements such that indices maintain their correlation with the values they are associated with, using a user-defined comparison function.
If two members compare as equal, they retain their original order. Prior to PHP 8.0.0, their relative order in the sorted array was undefined.
The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.
callback(mixed $a, mixed $b): int
Always returns true.
- ArrayIterator::asort() - Sort entries by values
- ArrayIterator::ksort() - Sort entries by keys
- ArrayIterator::natcasesort() - Sort entries naturally, case insensitive
- ArrayIterator::natsort() - Sort entries naturally
- ArrayIterator::uksort() - Sort by keys using a user-defined comparison function
- uasort() - Sort an array with a user-defined comparison function and maintain index association
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