Sorting Arrays In PHP

Array elements can be sorted in descending or ascending, alphabetical or numerical order.

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

Sort Array in Ascending Order - sort()

The following example sorts the elements of the $num array in ascending numerical order:

Example 1:

<?php

$num = array(44, 76, 24, 2, 115);

sort($num);

$len = count($num);

for($x = 0; $x < $len; $x++) {

    echo $num[$x];

    echo "<br>";

}

?>

Output:

2
24
44
76
115

Example 2:

<?php

$name = array("dev", "surya", "chandan");

sort($name);

$len = count($name);

for($x = 0; $x < $len; $x++) {

    echo $name[$x];

    echo "<br>";

}

?>

Output:

chandan
dev
surya

Sort Array in Descending Order - rsort()

The following example sorts the elements of the $num array in descending alphabetical order:

Example 1:

<?php

$num = array(44, 76, 24, 2, 115);

rsort($num);

 $len = count($num);

for($x = 0; $x < $len; $x++) {

    echo $num[$x];

    echo "<br>";

}

?>

Output:

115
76
44
24
2

 Example 2:

<?php

$name = array("dev", "surya", "chandan");

rsort($name);

$len = count($name);

for($x = 0; $x < $len; $x++) {

    echo $name[$x];

    echo "<br>";

}

?>

Output:

surya
dev
chandan

Sort Array (Ascending Order), According to Value - asort()

The following example sorts an associative array in ascending order, according to the value:

Example :

<?php

$id = array("dev"=>"45", "surya"=>"25", "gopal"=>"33");

asort($id);

foreach($id as $x => $x_demo) {

    echo "Key=" . $x . ", Value=" . $x_demo;

    echo "<br>";

}

?>

Output:

Key=surya, Value=25
Key=gopal, Value=33
Key=dev, Value=45

Sort Array (Ascending Order), According to Key - ksort()

The following example sorts an associative array in ascending order, according to the key:

Example:

<?php

$id = array("dev"=>"45", "surya"=>"25", "gopal"=>"33");

ksort($id);

foreach($id as $x => $x_demo) {

    echo "Key=" . $x . ", Value=" . $x_demo;

    echo "<br>";

}

?>

Output:

Key=dev, Value=45
Key=gopal, Value=33
Key=surya, Value=25

Sort Array (Descending Order), According to Value - arsort()

The following example sorts an associative array in descending order, according to the value:

Example:

<?php

$id = array("dev"=>"45", "surya"=>"25", "gopal"=>"33");

arsort($id);

foreach($id as $x => $x_demo) {

    echo "Key=" . $x . ", Value=" . $x_demo;

    echo "<br>";

}

?>

Output:

Key=dev, Value=45
Key=gopal, Value=33
Key=surya, Value=25

 Sort Array (Descending Order), According to Key - krsort()

The following example sorts an associative array in descending order, according to the key:

Example:

<?php

$id = array("dev"=>"45", "surya"=>"25", "gopal"=>"33");

krsort($id);

foreach($id as $x => $x_demo) {

    echo "Key=" . $x . ", Value=" . $x_demo;

    echo "<br>";

}

?>

Output:

Key=surya, Value=25
Key=gopal, Value=33
Key=dev, Value=45