Sorting Arrays

PHP has several functions that deal with sorting arrays, and this document exists to help sort it all out.

The main differences are:

Sorting function attributes
Function name Sorts by Maintains key association Order of sort Related functions
array_multisort() value string keys yes, int keys no first array or sort options array_walk()
asort() value yes ascending arsort()
arsort() value yes descending asort()
krsort() key yes descending ksort()
ksort() key yes ascending krsort()
natcasesort() value yes natural, case insensitive natsort()
natsort() value yes natural natcasesort()
rsort() value no descending sort()
shuffle() value no random array_rand()
sort() value no ascending rsort()
uasort() value yes user defined uksort()
uksort() key yes user defined uasort()
usort() value no user defined uasort()