Hello Readers

Below is the Sorting functions in PHP:

1. sort(): It is an array function which is used to sorts the array and it will be arranged the elements in ascending order (lowest to highest).

Example of sort():

<?php  
$subject = array("Language",  "English", "Math", "History");  
sort($subject);  
foreach ($subject as $key => $val)  
{  
echo "subject[ " . $key . "] = " . $val . "<br />";  
}  
?>

Output :
subject[ 0] = English
subject[ 1] = History
subject[ 2] = Language
subject[ 3] = Math

2. rsort(): It is an array function which is used to sorts the array and it will be arranged the elements in descending order (highest to lowest). It is basically the reverse of sort() function.

Example of rsort():

<?php
$subject = array("Language", "English", "Math", "History");  
rsort($subject);  
foreach ($subject as $key => $val)  
{  
echo "subject[ " . $key . "] = " . $val . "<br />";  
}
?>

Output :
subject[ 0] = Math
subject[ 1] = Language
subject[ 2] = History
subject[ 3] = English

3. asort(): It is an array function which is used to sorts an array and this function maintain index association.

Example of asort():

<?php  
$subject = array('d' => 'Language',  'c' => 'Math',  'a' => 'Science', 'b'=> 'Geography');  
asort($subject);  
foreach ($subject as $key => $val)  
{  
echo "$key = $val <br />";  
}
?>

Output :
b = Geography
d = Language
c = Math
a = Science

4. arsort(): It is an array function which is used to sorts an array in reverse order. This type of function also maintains index association as like asort(). It is a reverse of asort() function.

Example of arsort():

<?php
$subject = array('d' => 'Language',  'c' => 'Math',  'a' => 'Science', 'b'=> 'Geography');  
arsort($subject);  
foreach ($subject as $key=>$val)  
{  
echo "$key = $val <br />";  
}
?>

Output :
a = Science
c = Math
d = Language b = Geography

5. ksort(): It is an array function which is used to sorts an array but it sorts an array in associative array in ascending order, according to the key.

Example of ksort():

<?php 
$w3r_array = array("x" => "html", "y" => "xhtml", "z" => "xml");  
krsort($w3r_array);  
print_r($w3r_array);
?>

Output :
Array ( [x] => html [y] => xhtml [z] => xml )

6. krsort(): It is an array function which is used to sorts an array and is used to sort an array by key in reverse order.

Example of krsort():

<?php 
$w3r_array = array("x" => "html", "y" => "xhtml", "z" => "xml");  
krsort($w3r_array);  
print_r($w3r_array);
?>

Output :
Array ( [z] => xml [y] => xhtml [x] => html )

7. uksort(): It is an array function which is used to sorts an array by the element keys using user defined comparison function.

Example of uksort():

<?php  
function my_sort($x, $y)  
{  
if ($x == $y) return 0;  
return ($x > $y) ? -1 : 1;  
}  
$people = array("10" => "javascript",  
"20" => "php", "60" => "vbscript",  
"40" => "jsp");  
uksort($people, "my_sort");  
print_r ($people);
?>

Output :
Array ( [60] => vbscript [40] => jsp [20] => php [10] => javascript )