The PHP array_intersect_key() function compares the keys of two or more arrays, and returns an array of entries from array1 that exist in the other array(s).
Only the keys are compared. Not the values.
'Lamborghini', 'Car 2' => 'Ferrari', 'Car 3' => 'Maserati');
$a2 = array('Car 1' => 'Ferrari', 'Car 2' => 'Lamborghini', 'Car 4' => 'Maserati');
$result = array_intersect_key($a1, $a2);
print_r($result);
?>
Output
Array ( [Car 1] => Lamborghini [Car 2] => Ferrari )
Syntax
array_intersect_key(array1, array2, array3, ...)
Parameters
Parameter | Description |
---|---|
array1 | The array to compare from (required) |
array2 | The array to compare against (required) |
array3, ... | Additional arrays to compare against |
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PHP NOTES:
- When using PHP, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
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