PHP array_intersect() Function
Definition
The array_intersect()
function returns a new array containing all the values of array
$arr1
that exist in array $arr2
.
You can intersect several arrays simultaneously by providing more parameters to the function. For example:
$arr1_shared = array_intersect($arr1, $arr2, $arr3, $arr4);
Syntax
PHP array_intersect() Function has the following syntax.
array array_intersect ( array arr1, array arr2 [, array ...] )
Parameter
Parameter | Is Required | Description |
---|---|---|
array1 | Required. | Array to compare from |
array2 | Required. | Array to compare against |
array3,... | Optional. | Arrays to compare against |
Example 1
<?PHP//w w w. j ava 2 s . c o m
$toppings1 = array("A", "B", "C", "java2s.com");
$toppings2 = array("C", "java2s.com", "D");
$int_toppings = array_intersect($toppings1, $toppings2);
var_dump($int_toppings);
?>
The code above generates the following result.
Example 2
The array_intersect()
function will try to retain array keys when possible.
For example, if you are intersecting two arrays that have no duplicate keys, all the keys will
be retained. However, if there are key clashes, array_intersect()
will use the first
array to contain it. For example:
<?PHP//w ww . j a va 2s . com
$arr1 = array("A"=>25, "B"=>38, "C"=>27);
$arr2 = array("B"=>99, "D"=>38);
var_dump(array_intersect($arr1, $arr2));
?>
The code above generates the following result.