array_diff_ukey

    (PHP 5 >= 5.1.0, PHP 7, PHP 8)

    array_diff_ukey — Computes the difference of arrays using a callback function on the keys for comparison

    Descrizione

    array_diff_ukey(array $array, array ...$arrays, callable $key_compare_func): array

    Compares the keys from array against the keys from arrays and returns the difference. This function is like array_diff() except the comparison is done on the keys instead of the values.

    Unlike array_diff_key() a user supplied callback function is used for the indices comparison, not internal function.

    Elenco dei parametri

    array

    The array to compare from

    arrays

    Arrays to compare against

    key_compare_func

    La funzione di confronto deve restituire un intero minore, uguale o maggiore di zero se il primo argomento è considerato essere minore, uguale o maggiore del secondo.

    callback(mixed $a, mixed $b): int
    Attenzione

    Returning non-integer values from the comparison function, such as float, will result in an internal cast to int of the callback's return value. So values such as 0.99 and 0.1 will both be cast to an integer value of 0, which will compare such values as equal.

    Valori restituiti

    Returns an array containing all the entries from array that are not present in any of the other arrays.

    Esempi

    Example #1 array_diff_ukey() example

    <?php
    function key_compare_func($key1, $key2)
    {
    if (    $key1 == $key2)
    return     0;
    else if (    $key1 > $key2)
    return     1;
    else
    return -    1;
    }

    $array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
    $array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);

    var_dump(array_diff_ukey($array1, $array2, 'key_compare_func'));
    ?>

    Il precedente esempio visualizzerà:

    array(2) {
  ["red"]=>
  int(2)
  ["purple"]=>
  int(4)
}

    Note

    Nota:

    This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff_ukey($array1[0], $array2[0], 'callback_func');.

    Vedere anche:

    • array_diff() - Calcola la differenza di due o più array
    • array_udiff() - Computes the difference of arrays by using a callback function for data comparison
    • array_diff_assoc() - Calcola la differenza tra array con un ulteriore controllo sull'indice
    • array_diff_uassoc() - Computes the difference of arrays with additional index check which is performed by a user supplied callback function
    • array_udiff_assoc() - Computes the difference of arrays with additional index check, compares data by a callback function
    • array_udiff_uassoc() - Computes the difference of arrays with additional index check, compares data and indexes by a callback function
    • array_diff_key() - Computes the difference of arrays using keys for comparison
    • array_intersect() - Calcola l'intersezione degli arrays
    • array_intersect_assoc() - Calcola l'intersezione degli array con un ulteriore controllo sugli indici
    • array_intersect_uassoc() - Computes the intersection of arrays with additional index check, compares indexes by a callback function
    • array_intersect_key() - Computes the intersection of arrays using keys for comparison
    • array_intersect_ukey() - Computes the intersection of arrays using a callback function on the keys for comparison

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