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array_udiff in PHP

Posted on December 4, 2021December 4, 2021 By christo No Comments on array_udiff in PHP

array array_udiff(array array1, array array2[, … array arrayN], string function)

Returns an array containing all the values in array1 that are not present in any of the other arrays. Only the values are used to check for equality; that is, “a” => 1 and “b” => 1 are considered equal. The function function is used to compare the values of the elements for equality. The function is called with two parameters—the values to compare. It should return an integer less than 0 if the first argument is less than the second, 0 if the first and second arguments are equal, and an integer greater than 0 if the first argument is greater than the second. The keys of the values are preserved

Example of array_udiff

<?php
// Arrays to compare
$array1 = array(new stdclass, new stdclass,
                new stdclass, new stdclass,
               );

$array2 = array(
                new stdclass, new stdclass,
               );

// Set some properties for each object
$array1[0]->width = 11; $array1[0]->height = 3;
$array1[1]->width = 7;  $array1[1]->height = 1;
$array1[2]->width = 2;  $array1[2]->height = 9;
$array1[3]->width = 5;  $array1[3]->height = 7;

$array2[0]->width = 7;  $array2[0]->height = 5;
$array2[1]->width = 9;  $array2[1]->height = 2;

function compare_by_area($a, $b) {
    $areaA = $a->width * $a->height;
    $areaB = $b->width * $b->height;
    
    if ($areaA < $areaB) {
        return -1;
    } elseif ($areaA > $areaB) {
        return 1;
    } else {
        return 0;
    }
}

print_r(array_udiff($array1, $array2, 'compare_by_area'));
?>
Array
(
    [0] => stdClass Object
        (
            [width] => 11
            [height] => 3
        )

    [1] => stdClass Object
        (
            [width] => 7
            [height] => 1
        )

)
php Tags:array_udiff in PHP, php

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