PHP Unconference Europe 2015

array_diff_uassoc

(PHP 5)

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

Descrizione

array array_diff_uassoc ( array $array1 , array $array2 [, array $... ], callable $key_compare_func )

Compares array1 against array2 and returns the difference. Unlike array_diff() the array keys are used in the comparison.

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

Elenco dei parametri

array1

The array to compare from

array2

An array to compare against

...

More 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.

int callback ( mixed $a, mixed $b )

Valori restituiti

Returns an array containing all the entries from array1 that are not present in any of the other arrays.

Esempi

Example #1 array_diff_uassoc() 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 in the second argument "red" has key which is 1.

<?php
function key_compare_func($a$b)
{
    if (
$a === $b) {
        return 
0;
    }
    return (
$a $b)? 1:-1;
}

$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 a n-dimensional array. Of course you can 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 due o più 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 a callback functions

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User Contributed Notes 1 note

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2
MD. ABU SAYEM
7 months 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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