PHP - array_uintersect

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Metóda - array_uintersect

(PHP 5, PHP 7)

The function compares the values of at least two arrays according to a user-defined comparison function and returns their intersection.

Procedurálne

• function array_uintersect (array $array1, array $array2, array $..., callable $value_compare_func) : array
• function callback () : array

Parametre

Názov	Dátový typ	Predvolená hodnota	Popis
$array1	array		The main array, which is compared to the following arrays.
$array2	array		An array which is compared to the first one.
$...	array		More arrays which are compared to the first one.
$value_compare_func	callable		Specifies a callable comparison function. The function must return a negative integer if the first argument of the function is less than the second argument, a positive integer if it's greater or zero if they're equal. Note: If a compared value is a string, the comparison is case sensitive.

Mávratovej hodnoty

Vracia: array

The function returns an array containing elements from the first array which values are present in all of the other arrays.

Príklady

The function compares values of arrays and therefore there is no difference if we use an indexed or an associative array.

<?php
// The comparison function:
function compare_values($value1, $value2) {
    if ($value1 === $value2) {
        return 0;
    }
    return ($value1 > $value2) ? 1 : -1;
}
$seminar1 = array("Terminator", "Rambo", "McCane", "Tarzan", "Batman");
$seminar2 = array("Superman", "Norris", "Rambo", "Hulk", "Batman");
$seminar3 = array("Rambo", "Tarzan", "batman", "Norris");
$result = array_uintersect($seminar1, $seminar2, $seminar3, "compare_values");
// The only student in the result is Rambo.
// Batman is in the last array with small "b", therefore he is not in the result.
print_r($result);

We modify our comparison function, so the comparison will be case insensitive.

<?php
function compare_values_2($value1, $value2) {
    if (strtolower($value1) == strtolower($value2)) {
        return 0;
    }
    return (strtolower($value1) > strtolower($value2)) ? 1 : -1;
}
$seminar1 = array("Terminator", "Rambo", "McCane", "Tarzan", "Batman");
$seminar2 = array("Superman", "Norris", "Rambo", "Hulk", "Batman");
$seminar3 = array("Rambo", "Tarzan", "batman", "Norris");
$result = array_uintersect($seminar1, $seminar2, $seminar3, "compare_values_2");
// Now in the result is also Batman.
print_r($result);