PHP array_intersect_ukey() Function

Example

Compare the keys of two arrays (using a user-defined key comparison function), and return the matches:

<?php
function myfunction($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}

$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("a"=>"blue","b"=>"black","e"=>"blue");

$result=array_intersect_ukey($a1,$a2,"myfunction");
print_r($result);
?>

Try it Yourself »

Definition and Usage

The array_intersect_ukey() function compares the keys of two (or more) arrays, and returns the matches.

Note: This function uses a user-defined function to compare the keys!

This function compares the keys of two or more arrays, and return an array that contains the entries from array1 that are present in array2, array3, etc.

Syntax

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

Parameter Values

Parameter	Description
array1	Required. The first array is the array that the others will be compared with
array2	Required. An array to be compared with the first array
array3,...	Optional. An array to be compared with the first array
myfunction	Required. A string that define a callable comparison function. The comparison function must return an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument

Technical Details

Return Value:	Returns an array containing the entries from array1 that are present in all of the other arrays
PHP Version:	5.1.0+

More Examples

Example

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

<?php
function myfunction($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}

$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("a"=>"black","b"=>"yellow","d"=>"brown");
$a3=array("e"=>"purple","f"=>"white","a"=>"gold");

$result=array_intersect_ukey($a1,$a2,$a3,"myfunction");
print_r($result);
?>

Try it Yourself »

❮ PHP Array Reference