PHP - array_filter

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Metóda - array_filter

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

Tests each item in the input array against a given callback. If the callback returns true, the item will be present in array returned by this function, false otherwise. Array keys are preserved.

Caution: Modification of the input array from the callback (eg. adding, deleting or unsetting items) is classified as unexpected behavior. This usage of the callback is discouraged.

Procedurálne

• function array_filter (array $array, int $flag = 0) : array

Parametre

Názov	Dátový typ	Predvolená hodnota	Popis
$array	array		Array, whose items will be tested against a given callback.
$flag	int	0	Callback flag. ARRAY_FILTER_U­SE_KEY constant: Only one parameter will be passed to the callback - item value. ARRAY_FILTER_U­SE_BOTH constant: Two parameters will be passed to the callback - item key and value.

Mávratovej hodnoty

Vracia: array

Returns array with items, against which the callback returned true.

Príklady

This example filters out every item, that is considered empty by the empty() function.

<?php function filterEmpty($x) {
    return !empty($x);
}

$array = array(false, null, 0, '0', '', 'NonEmptyValue', 'NonEmptyValue2'); $filteredArray = array_filter($array, filterEmpty); var_dump($filteredArray);