An array is a collection of elements stored together. Every element in an array belong to a similar data type. The elements in the array are recognized by their index values. The elements can be subjected to a variety of operations, including reversal. There are various ways to reverse the elements of an array :
Approach 1: Using for Loop, a decrement for loop can be initiated in order to access the elements in the reverse order. The index begins at the length of the array – 1 until it reaches the beginning of the array. During each iteration, the inbuilt array_push method is called, which is used to push the elements to the newly declared array maintained for storing reverse contents.
Syntax:
array_push($array, $element)
PHP
<?php // Declaring an array $arr = array (1, 2, 3, 4, 5); echo ( "Original Array : " ); print_r( $arr ); // Declaring an array to store reverse $arr_rev = array (); for ( $i = sizeof( $arr ) - 1; $i >= 0; $i --) { array_push ( $arr_rev , $arr [ $i ]); } echo ( "Modified Array : " ); print_r( $arr_rev ); ?> |
Original Array : Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 ) Modified Array : Array ( [0] => 5 [1] => 4 [2] => 3 [3] => 2 [4] => 1 )
Approach 2 : Using array_reverse() Method, the array_reverse() function can be used to reverse the contents of the specified array. The output is also returned in the form of an array.
Syntax:
array_reverse($array)
PHP
<?php // Declaring an array $arr = array (1, 2, 3, 4, 5); echo ( "Original Array : " ); print_r( $arr ); // Reversing array $arr_rev = array_reverse ( $arr ); echo ( "Modified Array : " ); print_r( $arr_rev ); ?> |
Original Array : Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 ) Modified Array : Array ( [0] => 5 [1] => 4 [2] => 3 [3] => 2 [4] => 1 )