PHP array_diff_ukey() Function (original) (raw)

Last Updated : 20 Jun, 2023

The array_diff_ukey() function is an inbuilt function in PHP. It is used to compares the key two or more arrays using a user-defined function, and return an array, which is array1 and its not present any others array2, array3 or more... Syntax:

array_diff_ukey($array1, array2,array2, array2,array3..., arr_diffukeyFunction)

Parameters Used: This function accepts minimum three parameters and all three parameter is mandatory and the other is optional. The parameters are described below:

$array1(mandatory): The array will be compared with other arrays.(such that array compare from array1).
$array2(mandatory): The array Compared with the first array.
$array3(Optional): The array Compared with the first array.
arr_diffukeyFunction(mandatory): It is Required user-defined function. A string that defines a callable comparison function. The comparison function returns an integer than 0 if the first argument is than the second argument.

Return Value: Returns an array containing the entries from array1 that are not present in other arrays such as:-(arra2, arra3, arar4....more). If all values are present in other arrays the function return NULL. The return value type is an array. Example 1:

Input: $arr1 = array("one"=>"C Program", "two"=>"PHP Program", "three"=>"Java Program "); $arr2 = array("one"=>"Java Program", "two"=>"C++ Program", "six"=>"Java Program");

Output: Array ( [three] => Java Program )

Explanation: First two values of arr1 are matched with arr2 and last value not matched so the function returns last value.

Example 2:

Input: $arr1=array("one"=>"C Program", "two"=>"PHP Program", "three"=>"Java Program "); $arr2=array("one"=>"Java Program", "two"=>"C++ Program", "three"=>"Java Program");

Output: Array ( )

Explanation: All values are matched with arr2 so function return null values.

Let's take an example for understand the array_diff_ukey() Function.

Program 1 : Taking two array (array1 and array2) and using user-defined key comparison function (diffukeyFunction). Simple solution in PHP language : PHP `

$two) ? 1 : -1; } // Driver Code $arr1 = array( "one" => "C Program", "two" => "PHP Program", "three" => "Java Program " ); $arr2 = array( "one" => "Java Program", "two" => "C++ Program", "six" => "Java Program" ); result=arraydiffukey(result = array_diff_ukey(result=arraydiffukey(arr1, $arr2, "arr_diffukeyFunction"); print_r($result); ?>

Output:

Array ( [three] => Java Program )

Program 2 : Take three array (array1, array2 and arra3) and using user-defined key comparison function (diffukeyFunction). PHP `

$two) ? 1 : -1; } // Driver Code $arr1 = array( "one" => "C Program", "two" => "PHP Program", "three" => "Java Program " ); $arr2 = array( "one" => "XML Program", "two" => "C++ Program", "four" => "CSS Program" ); $arr3 = array( "five" => "MVC Program", "six" => "C# Program", "one" => "ASP .NET Program" ); result=arraydiffukey(result = array_diff_ukey(result=arraydiffukey(arr1, arr2,arr2, arr2,arr3, "arr_diffukeyFunction"); print_r($result); ?>

Output:

Array ( [three] => Java Program )

Program 3 : Return Null if all values are matched in other arrays php `

$two) ? 1 : -1; } // Driver Code $arr1 = array( "one" => "C Program", "two" => "PHP Program" ); $arr2 = array( "one" => "Java Program", "two" => "C++ Program" ); result=arraydiffukey(result = array_diff_ukey(result=arraydiffukey(arr1, $arr2, "arr_diffukeyFunction"); print_r($result); ?>

Output:

Array ( )

Program 4 : If we take only one array (array1) and using user-defined key comparison function (diffukeyFunction)There are no output and it gives "RUNTIME ERROR" warning message. PHP `

$two) ? 1 : -1; } // Driver Code $arr1 = array( "one" => "C Program", "two" => "PHP Program", "three" => "Java Program " ); //take only one array result=arraydiffukey(result = array_diff_ukey(result=arraydiffukey(arr1, "arr_diffukeyFunction"); print_r($result); ?>

Output:

No Output

Warning:

PHP Warning: array_diff_ukey(): at least 3 parameters are required, 2 given in /home/c0177af9f69e897ad93cc9855a9ae415.php on line 23