array_diff_uassoc

(PHP 5, PHP 7, PHP 8)

array_diff_uassoc — Computes the difference of arrays with additional index check which is performed by a user supplied callback function

Descrizione

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

Compares array against arrays and returns the difference. Unlike array_diff() the array keys are used in the comparison.

Unlike array_diff_assoc() 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_uassoc() example

In this example the "a" => "green" pair is present in both arrays and thus it is not in the output from the function. Unlike this, the pair 0 => "red" is in the output because the key of "red" is automatically assigned to 0 in the first array, whereas it is assigned to 1 in the second array as the key 0 is already taken by yellow.

<?php
function key_compare_func($a, $b)
{
    return $a <=> $b;
}

$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_uassoc($array1, $array2, "key_compare_func");
print_r($result);
?>

Il precedente esempio visualizzerà:

Array
(
    [b] => brown
    [c] => blue
    [0] => red
)

The equality of 2 indices is checked by the user supplied callback function.

Note

Nota:
This function only checks one dimension of an n-dimensional array. It is possible to check deeper dimensions by using, for example, array_diff_uassoc($array1[0], $array2[0], "key_compare_func");.

Vedere anche:

array_diff() - Calcola la differenza di due o più array
array_diff_assoc() - Calcola la differenza tra array con un ulteriore controllo sull'indice
array_udiff() - Computes the difference of arrays by using a callback function for data comparison
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_intersect() - Calcola l'intersezione degli arrays
array_intersect_assoc() - Calcola l'intersezione degli array con un ulteriore controllo sugli indici
array_uintersect() - Computes the intersection of arrays, compares data by a callback function
array_uintersect_assoc() - Computes the intersection of arrays with additional index check, compares data by a callback function
array_uintersect_uassoc() - Computes the intersection of arrays with additional index check, compares data and indexes by separate callback functions

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User Contributed Notes 1 note

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MD. ABU SAYEM ¶

10 years ago


//array_diff_uassoc for multidimenssional array
$color_1=array('a'=>'white','b'=>'red','c'=>array('a'=>'green','b'=>'blue','c'=>'yellow'));
$color_2=array('a'=>'white','b'=>'red','c'=>array('a'=>'white','b'=>'red','c'=>'yellow'));

function key_compare($a,$b){
    if($a===$b)        return 0;
    return($a>$b)?1:-1;
}
print_r(array_diff_uassoc($color_1['c'], $color_2['c'],"key_compare"));

//Output
 Array
(
    [a] => green
    [b] => blue
)

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