PHP array_intersect_uassoc() function

The array_intersect_uassoc () function in PHP is used to compute the intersection of arrays with the help of an additional index check, comparing indexes by a callable function. It returns an array containing all the entries from array1 that are present in all the other arrays.

Syntax

array_intersect_uassoc ( array $array1 , array $array2 [, array $... ], callable $key_compare_func ) 

Parameter

array1(required)- This parameter signifies the input array to compare from.

array2(required)- This parameter signifies the input array to compare against.

array3….(optional)- It represents more arrays to compare against.

key_compare_func(required)- This parameter represents a string that describe a callable comparison function. The comparison function must return an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument.

Return

This function returns an array containing all the values in array1 that are present in all the other arrays.

Example 1

 "green", "b" => "brown", "i" => "indigo", "red");
//initializing the input array1
$array2 = array("g" => "GREEN", "b" => "brown", "yellow", "red");
//return the intersection of arrays
print_r(array_intersect_uassoc($array1, $array2, "strcasecmp"));
?> 

Output

Array
(
[b] => brown
) 

Example 2

$b)?1:-1;
}

$array1=array("1"=>"red","2"=>"green","3"=>"blue");
$array2=array("1"=>"red","5"=>"green","9"=>"blue");
$array3=array("1"=>"red","4"=>"green","7"=>"red");
// comparing the keys and values with additional index check 
$intersection=array_intersect_uassoc ($array1,$array2,$array3,"myfunction");
//returns the intersection
print_r($intersection);
?> 

Output

Array
(
[1] => red
)

Example 3

 $b)? 1: 0; 
 } 
 // initializing the Input Array 1 
 $array1 = array(05=>"Reema", 10=>"raj", 30=>"Atul"); 
 // initializing the Input Array 2
 $array2 = array(05=>"Reema", 25=>"Reema", 30=>"Atul",70=>"Atul"); 
 // comparing the keys and values with additional index check  
 $intersection=array_intersect_uassoc($array1, $array2, "my_function"); 
 //returning the intersection
 print_r($intersection); 
 ?> 

Output

Array
(
 [5] => Reema
 [30] => Atul
)