List of array sorting function in php with example and syntax

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Sorting is an essential operation when working with arrays in programming. In PHP, there are several array sorting functions available, each with its own unique features and syntax. In this article, we’ll explore the most commonly used array sorting functions in PHP along with their explanations, syntax, and examples.

sort()

The sort() function sorts an array in ascending order. It takes an array as an argument and returns a boolean value indicating whether the sorting was successful or not.

Syntax: 

sort(array $array [, int $sort_flags = SORT_REGULAR]): bool

Example:

$fruits = array("banana", "apple", "orange", "grape");sort($fruits);print_r($fruits);

Output:

Array(    [0] => apple    [1] => banana    [2] => grape    [3] => orange)

Read Also : Commonly used php built-in functions list with examples

rsort()

The rsort() function sorts an array in descending order. It takes an array as an argument and returns a boolean value indicating whether the sorting was successful or not.

Syntax: 

rsort(array $array [, int $sort_flags = SORT_REGULAR]): bool

Example:

$numbers = array(5, 3, 1, 4, 2);rsort($numbers);print_r($numbers);

Output:

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

asort()

The asort() function sorts an array in ascending order by value while maintaining the key-value associations. It takes an array as an argument and returns a boolean value indicating whether the sorting was successful or not.

Syntax: 

asort(array &$array [, int $sort_flags = SORT_REGULAR]): bool

Example:

$age = array("Peter" => "35", "John" => "40", "Mary" => "25");asort($age);print_r($age);

Output:

Array(    [Mary] => 25    [Peter] => 35    [John] => 40)

Read Also : 10 important php functions with examples and explanation

arsort()

The arsort() function sorts an array in descending order by value while maintaining the key-value associations. It takes an array as an argument and returns a boolean value indicating whether the sorting was successful or not.

Syntax: 

arsort(array &$array [, int $sort_flags = SORT_REGULAR]): bool

Example:

$age = array("Peter" => "35", "John" => "40", "Mary" => "25");arsort($age);print_r($age);

Output:

Array(    [John] => 40    [Peter] => 35    [Mary] => 25)

ksort()

The ksort() function sorts an array in ascending order by key. It takes an array as an argument and returns a boolean value indicating whether the sorting was successful or not.

Syntax: 

ksort(array &$array [, int $sort_flags = SORT_REGULAR]): bool

Example:

$age = array("Peter" => "35", "John" => "40", "Mary" => "25");ksort($age);print_r($age);

Output:

Array(    [John] => 40    [Mary] => 25    [Peter] => 35)

Read also : Top 10 important php array functions with examples and syntax

krsort()

The krsort() function sorts an array in descending order by key. It takes an array as an argument and returns a boolean value indicating whether the sorting was successful or not.

Syntax: 

krsort(array &$array [, int $sort_flags = SORT_REGULAR]): bool

Example:

$age = array("Peter" => "35", "John" => "40", "Mary" => "25");krsort($age);print_r($age);

Output:

Array(    [Peter] => 35    [Mary] => 25    [John] => 40)

usort()

The usort() function sorts an array using a user-defined comparison function. It takes an array as the first argument and a comparison function as the second argument. The comparison function should return an integer value indicating the order of the elements.

Syntax: 

usort(array &$array , callable $compare_function): bool

Example:

function compareLength($a, $b) {    $aLength = strlen($a);    $bLength = strlen($b);    if ($aLength == $bLength) {        return 0;    }    return ($aLength < $bLength) ? -1 : 1;}$fruits = array("banana", "apple", "orange", "grape");usort($fruits, "compareLength");print_r($fruits);

Output:

Array(    [1] => apple    [3] => grape    [0] => banana    [2] => orange)

Read also : Top 10 most used php string functions with examples and syntax

uasort()

The uasort() function sorts an array using a user-defined comparison function while maintaining the key-value associations. It takes an array as the first argument and a comparison function as the second argument. The comparison function should return an integer value indicating the order of the elements.

Syntax: 

uasort(array &$array , callable $compare_function): bool

Example:

function compareAge($a, $b) {    if ($a == $b) {        return 0;    }    return ($a < $b) ? -1 : 1;}$age = array("Peter" => 35, "John" => 40, "Mary" => 25);uasort($age, "compareAge");print_r($age);

Output:

Array(    [Mary] => 25    [Peter] => 35    [John] => 40)

In conclusion, sorting an array is an essential operation in programming, and PHP offers a range of array sorting functions to make it easier. By understanding the syntax and examples of these functions, you can choose the one that best suits your needs and use it effectively in your PHP programs.

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