sort Sort an array &reftitle.description; boolsort arrayarray intsort_flagsSORT_REGULAR This function sorts an array. Elements will be arranged from lowest to highest when this function has completed. ¬e.sort-unstable; &reftitle.parameters; array The input array. sort_flags The optional second parameter sort_flags may be used to modify the sorting behavior using these values: Sorting type flags: SORT_REGULAR - compare items normally; the details are described in the comparison operators section SORT_NUMERIC - compare items numerically SORT_STRING - compare items as strings SORT_LOCALE_STRING - compare items as strings, based on the current locale. It uses the locale, which can be changed using setlocale SORT_NATURAL - compare items as strings using "natural ordering" like natsort SORT_FLAG_CASE - can be combined (bitwise OR) with SORT_STRING or SORT_NATURAL to sort strings case-insensitively &reftitle.returnvalues; &return.success; &reftitle.examples; $val) { echo "fruits[" . $key . "] = " . $val . "\n"; } ?> ]]> &example.outputs; The fruits have been sorted in alphabetical order. $val) { echo "fruits[" . $key . "] = " . $val . "\n"; } ?> ]]> &example.outputs; The fruits have been sorted like natcasesort. &reftitle.notes; ¬e.no-key-association; Like most PHP sorting functions, sort uses an implementation of Quicksort. The pivot is chosen in the middle of the partition resulting in an optimal time for already sorted arrays. This is however an implementation detail you shouldn't rely on. Be careful when sorting arrays with mixed types values because sort can produce unexpected results, if sort_flags is SORT_REGULAR, &reftitle.seealso; asort rsort &seealso.array.sorting;