PHP | Program to delete an element from array using unset() function
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 $a = array("Harsh", "Bikash", "Nishant", "Barun", "Deep"); // unset command accepts 3rd index and // thus removes the array element at // that position unset($a[3]); print_r ($a); ?> |
Output:
Array
(
[0] => Harsh
[1] => Bikash
[2] => Nishant
[4] => Deep
)
Program 2:
<?php $a = array(1, 8, 9, 7, 3, 5, 4, ); // unset command accepts 3rd index and // thus removes the array element // at that position unset($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.
