PHP | ArrayIterator ksort() Function

0 0 1 minute read

The ArrayIterator::ksort() function is an inbuilt function in PHP which is used to sort the array element by key.

Syntax:

void ArrayIterator::ksort( void )

Parameters: This function does not accept any parameters.

Return Value: This function does not return any value.

Below programs illustrate the ArrayIterator::ksort() function in PHP:

Program 1:

<?php 
    
// Declare an ArrayIterator 
$arrItr = new ArrayIterator( 
    array( 
        5 => 'G', 
        4 => 'e', 
        3 => 'e', 
        2 => 'k', 
        1 => 's',  
        6 => 'f', 
        8 => 'o', 
        7 => 'r'
    ) 
); 
    
// Sort the array element by key 
$arrItr->ksort(); 
   
// Display the element 
while($arrItr->valid()) { 
    echo $arrItr->current() . " "; 
    $arrItr->next(); 
} 
    
?> 

Output:

s k e e G f r o

Program 2:

<?php 
   
// Declare an ArrayIterator 
$arrItr = new ArrayIterator( 
    array( 
        "a" => "Geeks", 
        "c" => "for", 
        "b" => "Geeks"
    ) 
); 
   
// Append the element into array 
$arrItr->append("Computer"); 
$arrItr->append("Science"); 
$arrItr->append("Portal"); 
  
// Sort the array element by key 
$arrItr->ksort(); 
  
// Display the result 
foreach($arrItr as $element) { 
    echo "key: " . $arrItr->key() . "  Value: "
            . $arrItr->current() . "\n"; 
} 
  
?> 

Output:

key: a  Value: Geeks
key: b  Value: Geeks
key: c  Value: for
key: 0  Value: Computer
key: 1  Value: Science
key: 2  Value: Portal

Reference: https://www.php.net/manual/en/arrayiterator.ksort.php

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