uasort Sort an array with a user-defined comparison function and maintain index association &reftitle.description; booluasort arrayarray callbackcmp_function This function sorts an array such that array indices maintain their correlation with the array elements they are associated with, using a user-defined comparison function. This is used mainly when sorting associative arrays where the actual element order is significant. &reftitle.parameters; array The input array. cmp_function See usort and uksort for examples of user-defined comparison functions. &reftitle.returnvalues; &return.success; &reftitle.examples; 4, 'b' => 8, 'c' => -1, 'd' => -9, 'e' => 2, 'f' => 5, 'g' => 3, 'h' => -4); print_r($array); // Sort and print the resulting array uasort($array, 'cmp'); print_r($array); ?> ]]> &example.outputs; 4 [b] => 8 [c] => -1 [d] => -9 [e] => 2 [f] => 5 [g] => 3 [h] => -4 ) Array ( [d] => -9 [h] => -4 [c] => -1 [e] => 2 [g] => 3 [a] => 4 [f] => 5 [b] => 8 ) ]]> &reftitle.seealso; usort &seealso.array.sorting;