The ArrayIterator::uksort() function is an inbuilt function in PHP which is used to sort the keys by using a user-defined comparison function.
Syntax:
void ArrayIterator::uksort( callable $cmp_function )
Parameters: This function accepts single parameter $cmp_function which holds the user defined comparison function.
Return Value: This function does not return any value.
Below programs illustrate the ArrayIterator::uksort() function in PHP:
Program 1:
<?php // Declare an ArrayIterator $arrItr = new ArrayIterator( array( "a" => 4, "b" => 2, "g" => 8, "d" => 6, "e" => 1, "f" => 9 ) ); // User defined comparator function function sorting($a, $b) { if($a == $b) return 0; return ($a < $b) ? -1 : 1; } $arrItr->uksort("sorting"); // Printing the sorted array. print_r($arrItr); ?> |
Output:
ArrayIterator Object
(
[storage:ArrayIterator:private] => Array
(
[a] => 4
[b] => 2
[d] => 6
[e] => 1
[f] => 9
[g] => 8
)
)
Program 2:
<?php // Declare an ArrayIterator $arrItr = new ArrayIterator( array( "b" => "for", "a" => "Geeks", "e" => "Science", "c" => "Geeks", "f" => "Portal", "d" => "Computer" ) ); // Declare a comparison function to sort // values in descending order function comparison($val1, $val2) { if ($val1 == $val2) { return 0; } else if($val1 > $val2) return -1; else return 1; } $arrItr->uksort('comparison'); // Print the sorted ArrayObject print_r($arrItr); ?> |
Output:
ArrayIterator Object
(
[storage:ArrayIterator:private] => Array
(
[f] => Portal
[e] => Science
[d] => Computer
=> Geeks
[b] => for
[a] => Geeks
)
)
Reference: https://www.php.net/manual/en/arrayiterator.uksort.php
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