PHP | Program to delete an element from array using unset() function
Last Updated :
27 Apr, 2018
Given an array of elements, we have to delete an element from the array by using the unset() function.
Examples:
Input : $arr = array("Harsh", "Nishant", "Bikash", "Barun");
unset($arr[3]);
Output : Array
(
[0] => Harsh
[1] => Nishant
[2] => Bikash
)
Input : $arr = array(1, 2, 6, 7, 8, 9);
unset($arr[3]);
Output : Array
(
[0] => 1
[1] => 2
[2] => 6
[4] => 8
[5] => 9
)
unset() function: The function accepts a variable name as parameter and destroy or unset that variable.
Approach: This idea to solve this problem using the unset function is to pass the array key of the respective element which we want to delete from the array as a parameter to this function and thus removes the value associated to it i.e. the element of an array at that index.
Below programs illustrate the above approach:
Program 1:
<?php
$a = array ( "Harsh" , "Bikash" , "Nishant" , "Barun" , "Deep" );
unset( $a [3]);
print_r ( $a );
?>
|
Output:
Array
(
[0] => Harsh
[1] => Bikash
[2] => Nishant
[4] => Deep
)
Program 2:
<?php
$a = array (1, 8, 9, 7, 3, 5, 4, );
unset( $a [5]);
print_r ( $a );
?>
|
Output:
Array
(
[0] => 1
[1] => 8
[2] => 9
[3] => 7
[4] => 3
[6] => 4
)
Note: The array keys will not be reordered after using the unset() function.
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