PHP – Sorting Arrays

 

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

 

PHP – Sort Functions For Arrays

 

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 $cars array in ascending alphabetical order:

 

Example

 

<!DOCTYPE html>
<html>
<body>

<?php
$cars = array(“Volvo”, “BMW”, “Toyota”);
sort($cars);

$clength = count($cars);
for($x = 0; $x < $clength; $x++) {
echo $cars[$x];
echo “<br>”;
}
?>

</body>
</html>

 

Output

 

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

 

Example

 

<!DOCTYPE html>
<html>
<body>

<?php
$numbers = array(4, 6, 2, 22, 11);
sort($numbers);

$arrlength = count($numbers);
for($x = 0; $x < $arrlength; $x++) {
echo $numbers[$x];
echo “<br>”;
}
?>

</body>
</html>

Output

 

 

Sort Array in Descending Order – rsort()

 

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

 

Example

 

<!DOCTYPE html>
<html>
<body>

<?php
$cars = array(“Volvo”, “BMW”, “Toyota”);
rsort($cars);

$clength = count($cars);
for($x = 0; $x < $clength; $x++) {
echo $cars[$x];
echo “<br>”;
}
?>

</body>
</html>

Output

 

 

The following example sorts the elements of the $numbers array in descending numerical order:

 

Example

 

<!DOCTYPE html>
<html>
<body>

<?php
$numbers = array(4, 6, 2, 22, 11);
rsort($numbers);

$arrlength = count($numbers);
for($x = 0; $x < $arrlength; $x++) {
echo $numbers[$x];
echo “<br>”;
}
?>

</body>
</html>

 

Output

 

 

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

 

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

 

Example

 

<!DOCTYPE html>
<html>
<body>

<?php
$age = array(“Peter”=>”35”, “Ben”=>”37”, “Joe”=>”43”);
asort($age);

foreach($age as $x => $x_value) {
echo “Key=” . $x . “, Value=” . $x_value;
echo “<br>”;
}
?>

</body>
</html>

 

Output

 

 

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

 

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

 

Example

 

<!DOCTYPE html>
<html>
<body>

<?php
$age = array(“Peter”=>”35”, “Ben”=>”37”, “Joe”=>”43”);
ksort($age);

foreach($age as $x => $x_value) {
echo “Key=” . $x . “, Value=” . $x_value;
echo “<br>”;
}
?>

</body>
</html>

 Output

 

 

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

 

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

 

Example

 

<!DOCTYPE html>
<html>
<body>

<?php
$age = array(“Peter”=>”35”, “Ben”=>”37”, “Joe”=>”43”);
arsort($age);

foreach($age as $x => $x_value) {
echo “Key=” . $x . “, Value=” . $x_value;
echo “<br>”;
}
?>

</body>
</html>

 

Output

 

 

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

 

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

 

Example

 

<!DOCTYPE html>
<html>
<body>

<?php
$age = array(“Peter”=>”35”, “Ben”=>”37”, “Joe”=>”43”);
krsort($age);

foreach($age as $x => $x_value) {
echo “Key=” . $x . “, Value=” . $x_value;
echo “<br>”;
}
?>

</body>
</html>

 

Output