PHP - array_diff_key

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Metóda - array_diff_key

(PHP 5 >= 5.1.0, PHP 7)

The function compares the keys of the arrays and returns the difference.

Note: The function doesn't work recursively for multidimensional arrays.

Procedurálne

• function array_diff_key (array $array1, array $array2, array $...) : array

Parametre

Názov	Dátový typ	Predvolená hodnota	Popis
$array1	array		The keys of the array are compared to the keys in the following arrays. If the key is a string, the comparison is case sensitive.
$array2	array		The array which keys are compared to the keys in the first array.
$...	array		More arrays which keys are compared to the keys in the first array.

Mávratovej hodnoty

Vracia: array

The function returns an array containing the elements from the first array which keys are not present in any other array.

Príklady

In the first example we have two associative arrays and compare their keys:

<?php
$pole1 = array("firstName" => "Chuck", "lastName" => "Norris", "age" => 30, "movie" => "The Delta Force");
$pole2 = array("age" => 50, "movie" => "Rambo 1");
print_r(array_diff_key($pole1, $pole2));

echo "<br>";

// If the key is a string, the comparison is case sensitive:
$pole2 = array("age" => 50, "MOVIE" => "Rambo 1");
print_r(array_diff_key($pole1, $pole2));

In the second example we have two indexed arrays and compare their keys:

<?php
$pole1 = array("BMW", "Mercedes", "Audi", "Volvo", "Subaru", "Lexus");
$pole2 = array(4 => "Honda", "Mazda", "VW");
print_r(array_diff_key($pole1, $pole2));

In the third example we have three different arrays:

<?php
$array1 = array("a" => "red", "b" => "blue", "c" => "yellow", "d" => "green", "e" => "white");
$array2 = array("a" => "Vovo", "d" => "Audi");
$array3 = array("b" => 1789, "d" => 2017);
print_r(array_diff_key($array1, $array2, $array3));