# PHP Functions in Sorting Arrays

PHP comes with a number of built-in functions designed specifically for sorting array elements in different ways like alphabetically or numerically in ascending or descending order. Here we’ll explore some of these functions most commonly used for sorting arrays.

- sort() and rsort() — For sorting indexed arrays
- asort() and arsort() — For sorting associative arrays by value
- ksort() and krsort() — For sorting associative arrays by key

## Sorting Indexed Arrays in Ascending Order

The sort() function is used for sorting the elements of the indexed array in ascending order (alphabetically for letters and numerically for numbers).

This print_r() statement gives the following output:

Array ( [0] => Blue [1] => Green [2] => Red [3] => Yellow )

Similarly you can sort the numeric elements of the array in ascending order.

This print_r() statement gives the following output:

Array ( [0] => 1 [1] => 2 [2] => 2.5 [3] => 4 [4] => 7 [5] => 10 )

## Sorting Indexed Arrays in Descending Order

The rsort() function is used for sorting the elements of the indexed array in descending order (alphabetically for letters and numerically for numbers).

This print_r() statement gives the following output:

Array ( [0] => Yellow [1] => Red [2] => Green [3] => Blue )

## Sorting Associative Arrays in Ascending Order By Value

The asort() function sorts the elements of an associative array in ascending order according to the value. It works just like sort(), but it preserves the association between keys and their values while sorting.

This print_r() statement gives the following output:

Array ( [Harry] => 14 [Peter] => 20 [Clark] => 35 [John] => 45 )

## Sorting Associative Arrays in Descending Order By Value

The arsort() function sorts the elements of an associative array in descending order according to the value. It works just like rsort(), but it preserves the association between keys and its values while sorting.

This print_r() statement gives the following output:

Array ( [John] => 45 [Clark] => 35 [Peter] => 20 [Harry] => 14 )

## Sorting Associative Arrays in Ascending Order By Key

The ksort() function sorts the elements of an associative array in ascending order by their keys. It preserves the association between keys and its values while sorting, same as asort() function.

This print_r() statement gives the following output:

Array ( [Clark] => 35 [Harry] => 14 [John] => 45 [Peter] => 20 )

## Sorting Associative Arrays in Descending Order By Key

The krsort() function sorts the elements of an associative array in descending order by their keys. It preserves the association between keys and its values while sorting, same as arsort() function.

This print_r() statement gives the following output:

Array ( [Peter] => 20 [John] => 45 [Harry] => 14 [Clark] => 35 )

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