array_intersect_uassoc : intersection between two or more arrays by additional Keys also checked by user defined callback function

array_intersect_uassoc(): intersection between two arrays considering additional key checks through callback function

This function takes two or more arrays as input and then returns the result array as intersection considering both values and keys.

$new_array = array_intersect_uassoc ($array1, $array2,....,my_function());

my_function() : is the callback function to return integer less than , equal to or greater than zero after comparing the keys.

Returns all elements of $array1 which are present in $array2 considering keys also.

Example with two arrays

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

$first=array('One' =>'First','Two'=>'Second','Three'=>'Third','Fourth');
$second=array('One'=> 'First','2nd'=>'Second','Three'=>'Third','Fourth');

$result=array_intersect_uassoc($first,$second,"my_function");
while (list ($key, $val) = each ($result)) {
echo "$key -> $val <br>";
}

Output is here.

One -> First 
Three -> Third 
0 -> Fourth

Keys of the first index are retained. ( no re-indexing done here) .

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