Php array_udiff_assoc calculates the difference set instances of two arrays. arrayudiffassoc

Php array_udiff_assoc calculates the difference set instances of two arrays. arrayudiffassoc

The php array_udiff () function is used to compare the key names and key values of two (or more) arrays and return the difference set. This comparison is performed through the callback function provided by the user. If the first parameter is considered to be less than, equal to, or greater than the second parameter, an integer less than zero, equal to zero, or greater than zero must be returned. This article describes how to use the array_udiff () function through examples,

Array_udiff_assoc-calculate the difference set of the array with index check and use the callback function to compare data

Basic Syntax:

Array array_udiff_assoc (array $ array1, array $ array2 [, array $...], callable $ data_compare_func)
This comparison is performed through the callback function provided by the user. If the first parameter is considered to be less than, equal to, or greater than the second parameter, an integer less than zero, equal to zero, or greater than zero must be returned.

Note: This function only checks one dimension in a multi-dimensional array. Of course, you can use array_udiff_assoc ($ array1 [0], $ array2 [0], "some_comparison_func"); to check deeper dimensions.

Parameter Introduction

Parameters	Description
Array1	Required. The first array.
Array2	Required. The second array.
Myfunction	Required. String value, which defines the comparison function that can be called. When the first parameter is less than, equal to, or greater than the second parameter, the comparison function must return an integer less than, equal to, or greater than 0.

Return Value

Array_udiff_assoc () returns an array containing all values in the array of array1 but not any other parameters. Note that, unlike array_diff () and array_udiff (), the key name is also used for comparison. The array data is compared using the callback function provided by the user. In this regard, the behavior of array_diff_assoc () is the opposite. The latter is compared with internal functions.

Instance

<?phpclass cr {  private $priv_member;  function cr($val) {    $this->priv_member = $val;  }  static function comp_func_cr($a, $b) {    if ($a->priv_member === $b->priv_member) return 0;    return ($a->priv_member > $b->priv_member) ? 1 : -1;  }}$a = array(  "0.1" => new cr(9) ,  "0.5" => new cr(12) ,  0 => new cr(23) ,  1 => new cr(4) ,  2 => new cr(-15) ,);$b = array(  "0.2" => new cr(9) ,  "0.5" => new cr(22) ,  0 => new cr(3) ,  1 => new cr(4) ,  2 => new cr(-15) ,);$result = array_udiff_assoc($a, $b, array(  "cr",  "comp_func_cr"));print_r($result);?> 

Running result:

Array(  [0.1] => cr Object    (      [priv_member:private] => 9    )  [0.5] => cr Object    (      [priv_member:private] => 12    )  [0] => cr Object    (      [priv_member:private] => 23    ))

In the above example, we can see that the key-Value Pair "1" => new cr (4) appears in both arrays at the same time, so it is not in the output of this function.

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