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PHP: array_intersect_key() function

PHP: Computes the intersection of arrays using keys for comparison

The array_intersect_key() is used to create an array containing keys and values of the first array whose keys (i.e. from the first array) are present in all other arrays.

Version:

(PHP 4 and above)

Syntax:

array_intersect_key(array1, array2,....)

Parameters:

Name Description Required /
Optional		 Type
array1 The first array. Required Array
array2 An array to check keys against the first array. Required Array

Return value:

An associative array containing all the values of array1 which have matching keys that are present in all arguments.

Value Type: Array

Example:

<?php
$array1 = array("Orange" => 1, "Apple" => 2, "Banana" => 3, "Chery" =>4);
$array2 = array("Orange" => 5, "Banana" => 6, "Mango" =>7);
var_dump(array_intersect_key($array1, $array2));
?>

Output:

array(2) { ["Orange"]=> int(1) ["Banana"]=> int(3)}

Pictorial Presentation:

php function reference: array_intersect_key() function

View the example in the browser

Practice here online :

See also

PHP Function Reference

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PHP: Tips of the Day

Filters the collection using the given callback

Example:

<?php
function tips_reject($items, $func)
{
  return array_values(array_diff($items, array_filter($items, $func)));
}

print_r(tips_reject(['Apple', 'Pear', 'Kiwi', 'Banana'], function ($item) {
  return strlen($item) > 4;
}));
?>

Output:

Array
(
    [0] => Pear
    [1] => Kiwi
)