PHP Tutorial - PHP array_intersect_ukey() Function

Definition

The array_intersect_ukey() function compares the keys of two or more arrays, and returns the matches using a user-defined key comparison function.

Syntax

PHP array_intersect_ukey() Function has the following syntax.

array_intersect_ukey(array1,array2,array3...,myfunction)

Parameter

Parameter	Is Required	Description
array1	Required.	Array compared with
array2	Required.	Array to be compared with array1
array3,...	Optional.	Array to be compared with array1
myfunction	Required.	User function to do the comparison

myfunction defines a callable comparison function. The comparison function must return an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument

Example

Intersect keys with user defined function


<?php// w w w .java  2s  .  c o  m
    function myfunction($a,$b){
        if ($a===$b){
          return 0;
        }
        return ($a>$b)?1:-1;
    }
    $a1=array("a"=>"A","b"=>"Bed","c"=>"Cat","j"=>"java2s.com");
    $a2=array("d"=>"Dog","b"=>"Bed","p"=>"PHP");
    $result=array_intersect_ukey($a1,$a2,"myfunction");
    print_r($result);
?>

The code above generates the following result.

Example 2

Compare the keys of three arrays (use a user-defined function to compare the keys), and return the matches:


<?php//www. j a v a  2s.co  m
    function myfunction($a,$b){
        if ($a===$b){
          return 0;
        }
        return ($a>$b)?1:-1;
    }
    
    $a1=array("a"=>"A","b"=>"Bed","c"=>"Cat","j"=>"java2s.com");
    $a2=array("d"=>"Dog","b"=>"Bed","p"=>"PHP");
    $a3=array("J"=>"Java","a"=>"a","d"=>"dog");
    
    $result=array_intersect_ukey($a1,$a2,$a3,"myfunction");
    print_r($result);
?>

The code above generates the following result.