(PHP 4 >= 4.0.1, PHP 5, PHP 7)
array_intersect — Computes the intersection of arrays
array_intersect ( array $array , array ...$arrays ) : array
array_intersect() returns an array containing all the values of array that are present in all the arguments. Note that keys are preserved.
array
The array with master values to check.
arrays
Arrays to compare values against.
Returns an array containing all of the values in array whose values exist in all of the parameters.
Example #1 array_intersect() example
<?php
$array1 = array("a" => "green", "red", "blue");
$array2 = array("b" => "green", "yellow", "red");
$result = array_intersect($array1, $array2);
print_r($result);
?> The above example will output:
Array
(
[a] => green
[0] => red
)
Note: Two elements are considered equal if and only if
(string) $elem1 === (string) $elem2. In words: when the string representation is the same.
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https://www.php.net/manual/en/function.array-intersect.php