The array_intersect_ukey() function is an inbuilt function in PHP which is used to compute the intersection of two or more array against keys with the help of user-defined function and the function return an array. The returned array is the first array, which is matching keys and present in all parameters is the final output.
Syntax:
array array_intersect_ukey( $array1, $array2, ..., $ukey_intersectFunction )
Parameters: This function accepts two or more arrays and a $ukey_intersectFunction parameters as mentioned above and described below:
- $array1: It is the initial array used to compare with other array. It is mandatory parameter.
- $array2: The array compared with the first array key. It is mandatory parameter.
- $array. . . : The list of array arguments to compared with the first array key. It is optional parameters.
- $ukey_intersectFunction: It is required parameter which holds the user-defined function. A string that defines a callable comparison function.
Return Value: It returns an array containing the value of the first array whose keys exist in all others arguments.
Note: This function uses a user-defined function to compare the keys. Not compare values of keys.
Below examples illustrate the array_intersect_ukey() function in PHP:
Program 1: This program uses two array (array1 and array2) and a user-defined key comparison function (ukey_intersectFunction) to compute the intersection of arrays.
PHP
<?php // PHP program to illustrates the // array_intersect_ukey() function function ukey_intersectFunction($x, $y) { if ($x === $y) return 0; return ($x > $y)? 1: -1; } $a1 = array( "a" => "Java", "b" => "C++", "c" => "XML", "d" => "Python", "p" => "PHP"); $a2 = array( "a" => "Python", "b" => "CSS", "h" => "VB", "x" => "HTML", "p" => "SQL"); // Print results if the key is matching from both // array and print first array elements. $result = array_intersect_ukey($a1, $a2, "ukey_intersectFunction"); print_r($result); ?> |
Array
(
[a] => Java
[b] => C++
[p] => PHP
)
Program 2: This program uses four array(array1, array2, array3 and array4) and a user-defined key comparison function (ukey_intersectFunction) to compute the intersection of arrays.
PHP
<?php // PHP program to illustrates the // array_intersect_ukey() function function ukey_intersectFunction($x, $y) { if ($x === $y) return 0; return ($x > $y)? 1: -1; } // Arrays $arr1 = array( "a" => "A", "b" => "B", "c" => "D", "d" => "E", "p" => "F"); $arr2 = array( "o" => "A", "b" => "B", "h" => "V", "x" => "T", "p" => "X"); $arr3 = array( "a" => "N", "b" => "B", "h" => "O", "x" => "T", "p" => "P"); $arr4 = array( "s" => "W", "b" => "B", "z" => "D", "x" => "T", "p" => "P"); // Print the result if key is matching from both // array and print first array elements. $result = array_intersect_ukey($arr1, $arr2, $arr3, $arr4, "ukey_intersectFunction"); print_r($result); ?> |
Array
(
[b] => B
[p] => F
)
Program 3: This program uses three arrays (array1, array2, and array3) and a user-defined key comparison function to compute the intersection of arrays.
PHP
<?php // PHP program to illustrates the // array_intersect_ukey() function function ukey_intersectFunction($x, $y) { if ($x === $y) return 0; return ($x > $y)? 1: -1; } // Arrays $arr1 = array( "a" => "Bhopal", "b" => "New Delhi", "n" => "Madras", "o" => "Mumbai", "p" => "Finland"); $arr2 = array( "a" => "Bhubaneswar", "b" => "Ranchi", "n" => "Kolkata", "o" => "Lucknow", "p" => "Allahabad"); $arr3 = array( "a" => "Rourkela", "b" => "Jammu", "n" => "Kashmir", "o" => "Tripura", "p" => "Shillong"); // Print the result if key is matching from both // array and print first array elements. $result = array_intersect_ukey($arr1, $arr2, $arr3, "ukey_intersectFunction"); print_r($result); ?> |
Array
(
[a] => Bhopal
[b] => New Delhi
[n] => Madras
[o] => Mumbai
[p] => Finland
)
Program 4: This program uses two array (array1 and array2), and a user-defined key comparison function (ukey_intersectFunction) to compute the intersection of arrays. There are both array have different key then array return NULL/Empty Array.
PHP
<?php // PHP program to illustrates the // array_intersect_ukey() function function ukey_intersectFunction($x, $y) { if ($x === $y) return 0; return ($x > $y)? 1: -1; } // Arrays $arr1 = array( "a" => "IIT Shillong", "b" => "IIT Bhopal", "n" => "NIT Bhopal"); $arr2 = array( "x" => "IIT Bhubaneswar", "y" => "IIT Ranchi", "z" => "NIT Durgapur"); // Print the result if key is matching from both // array and print first array elements. $result = array_intersect_ukey($arr1, $arr2, "ukey_intersectFunction"); print_r($result); ?> |
Array ( )
Program 5: This program uses two array (array1 and array2) and both array have different key but same value in the same index. Compare the array and return the NULL/Empty Array.
PHP
<?php // PHP program to illustrates the // array_intersect_ukey() function function ukey_intersectFunction($x, $y) { if ($x === $y) return 0; return ($x > $y)? 1: -1; } // Arrays $arr1 = array( "a" => "IIT", "b" => "CIT", "n" => "NIT"); $arr2 = array( "x" => "IIT", "y" => "CIT", "z" => "NIT"); // Print the result if key is matching from both // array and print first array elements. $result = array_intersect_ukey($arr1, $arr2, "ukey_intersectFunction"); print_r($result); ?> |
Array ( )
Related Articles:
- PHP | array_diff_key() Function
- PHP | array_intersect_key() Function
- PHP | array_intersect() Function
- PHP | array_intersect_assoc() Function
- PHP | array_uintersect_assoc() Function
Reference: http://php.net/manual/en/function.array-intersect-ukey.php
