PHP array_intersect() Function: Syntax, Parameters, Return Value, and Examples

In PHP, the array_intersect() function compares two or more arrays and returns a new array containing all values that exist in every input array.

Syntax

array_intersect(array1, array2, array3...)

Parameters

array1 : Required, the base array for comparison.

array2 : Required, the array to compare with array1 .

array3, ... : Optional, additional arrays to compare with array1 .

Return Value

Returns an array containing all values that are present in every input array.

Examples

Example 1:

$array1 = array("apple", "banana", "orange", "grape");
$array2 = array("banana", "mango", "grape");
$result = array_intersect($array1, $array2);
print_r($result);

Output:

Array
(
    [1] => banana
    [3] => grape
)

Example 2:

$array1 = array(1, 2, 3, 4, 5);
$array2 = array(4, 5, 6, 7);
$result = array_intersect($array1, $array2);
print_r($result);

Output:

Array
(
    [3] => 4
    [4] => 5
)

Example 3:

$array1 = array("red", "green", "blue");
$array2 = array("green", "blue", "yellow");
$array3 = array("blue", "yellow", "pink");
$result = array_intersect($array1, $array2, $array3);
print_r($result);

Output:

Array
(
    [1] => green
    [2] => blue
)

Explanation: In each example, array_intersect() returns the elements that are common to all provided arrays, demonstrating its usefulness for extracting shared values.

Summary

The array_intersect() function is a commonly used PHP function that conveniently compares and extracts common elements from multiple arrays, helping developers handle array-related logic more efficiently.