array_intersect in PHP

Syntax of array_intersect

array array_intersect(array array1, array array2[, … array arrayN])

Returns an array consisting of every element in array1 that also exists in every other array

Example of array_intersect in PHP

<?php
$input = array("a" => 1, "b" => 1, "c" => 2);
$flipped = array_flip($input);

print_r($flipped);
?>
Array
(
    [1] => b
    [2] => c
)

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