PHP array_diff_ukey() Function

Complete PHP Array Reference

Definition and Usage

The array_diff_ukey() function compares the keys in two or more arrays, checking for differences, before comparing the keys in a user-defined function, then returns an array with the keys and values from the first array, if the function allows it.

Syntax

array_diff_ukey(array1,array2,array3...,function)

Tips and Notes

Tip: You can compare the first array with one array, or as many as you like.

Note: Only the keys have to be the same to get a match, both in the automatic comparison and in the user-defined function.

Example 1

<?php
function myfunction($v1,$v2) 
{
if ($v1===$v2)
	{
	return 0;
	}
if ($v1>$v2)
	{
	return 1;
	}
else
	{
	return -1;
	}
}
$a1=array(0=>"Dog",1=>"Cat",2=>"Horse");
$a2=array(3=>"Rat",1=>"Bird",5=>"Monkey");
print_r(array_diff_ukey($a1,$a2,"myfunction"));
?> 

The output of the code above will be:

Array ( [0] => Dog [2] => Horse )

Example 2

How to assign more than two arrays to the function

<?php
function myfunction($v1,$v2) 
{
if ($v1===$v2)
	{
	return 0;
	}
if ($v1>$v2)
	{
	return 1;
	}
else
	{
	return -1;
	}
}
$a1=array(0=>"Dog",1=>"Cat",2=>"Horse");
$a2=array(3=>"Rat",1=>"Bird",5=>"Monkey");
$a3=array(6=>"Dog",7=>"Donkey",0=>"Horse");
print_r(array_diff_ukey($a1,$a2,$a3,"myfunction"));
?> 

The output of the code above will be:

Array ( [2] => Horse )

Complete PHP Array Reference

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