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
<?php
function arr_diffukeyFunction( $one , $two )
{
`` if ( $one === $two ) {
`` return 0;
`` }
`` return ( $one > $two ) ? 1 : -1;
}
$arr1 = array (
`` "one" => "C Program" ,
`` "two" => "PHP Program" ,
`` "three" => "Java Program "
);
$arr2 = array (
`` "one" => "Java Program" ,
`` "two" => "C++ Program" ,
`` "six" => "Java Program"
);
$result = array_diff_ukey ( $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
<?php
function arr_diffukeyFunction( $one , $two )
{
`` if ( $one === $two ) {
`` return 0;
`` }
`` return ( $one > $two ) ? 1 : -1;
}
$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 = array_diff_ukey ( $arr1 , $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
<?php
function arr_diffukeyFunction( $one , $two )
{
`` if ( $one === $two ) {
`` return 0;
`` }
`` return ( $one > $two ) ? 1 : -1;
}
$arr1 = array (
`` "one" => "C Program" ,
`` "two" => "PHP Program"
);
$arr2 = array (
`` "one" => "Java Program" ,
`` "two" => "C++ Program"
);
$result = array_diff_ukey ( $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
<?php
function arr_diffukeyFunction( $one , $two )
{
`` if ( $one === $two ) {
`` return 0;
`` }
`` return ( $one > $two ) ? 1 : -1;
}
$arr1 = array (
`` "one" => "C Program" ,
`` "two" => "PHP Program" ,
`` "three" => "Java Program "
);
$result = array_diff_ukey ( $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