php sort arrays by key

The elements in an array can be sorted in alphabetical or numerical order, descending or ascending.

PHP – Sort Functions For Arrays

In this chapter, we will go through the following PHP array sort functions:

sort() – sort arrays in ascending order
rsort() – sort arrays in descending order
asort() – sort associative arrays in ascending order, according to the value
ksort() – sort associative arrays in ascending order, according to the key
arsort() – sort associative arrays in descending order, according to the value
krsort() – sort associative arrays in descending order, according to the key