PHP | Find Intersection of two arrays
Last Updated :
11 Jul, 2025
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You are given two arrays of n-elements each. You have to find all the common elements of both elements, without using any loop in php and print the resulting array of common elements.
Example:
PHP
Input : array1[] = {3, 5, 2, 7, 9}, array2[] = {4, 3, 2, 7, 8} Output : array ( [0] => 3, [1] => 2, [2] => 7) Input : array1[] = {3, 5, 7}, array2[] = {2, 4, 6} Output : array ( )In C/Java, we have to traverse one of the array and for each element you have to check its presence in second array. But PHP provides an inbuilt function (array_intersect()) which returns the common elements (intersect) of two array. array_intersect($array1, $array2) : Returns an array containing all the values of array1 that are present in array2. Note that keys are preserved. Note : As array_intersect() returns array with preserved keys, we will use array_values() which will re-order the keys.
// find intersect of both array $result = array_intersect($array1, $array2); // re-order keys $result = array_values($result); // print resultant array print_r($result);
<?php
// declare arrays
$array1 = array(2, 5, 7, 6, 9);
$array2 = array(3, 2, 5, 6, 8);
// find intersect of both array
$result = array_intersect($array1, $array2);
// re-order keys
$result = array_values($result);
// print resultant array
print_r($result);
?>
<?php
// declare arrays
$array1 = array(2, 5, 7, 6, 9);
$array2 = array(3, 2, 5, 6, 8);
// find intersect of both array
$result = array_intersect($array1, $array2);
// re-order keys
$result = array_values($result);
// print resultant array
print_r($result);
?>
Output:
Array ( [0] => 2 [1] => 5 [2] => 6 )