array_uintersect

Calculate the intersection of the array and compare the data using the callback function

Name:array_uintersect

Category:Array

Programming Language:php

One-line Description:Compare arrays, return intersections (compare values only, using a user-defined keyname comparison function).

Definition and usage

The array_uintersect() function is used to compare the key values of two (or more) arrays and return the intersection.

Note: This function uses a user-defined function to compare key values.

The function compares the key values of two (or more) arrays and returns an intersection array that includes all key values in the array being compared ( array1 ) and also in any other parameter array ( array2 or array3 , etc.).

Example

Example 1

Compare the key values of two arrays (using user-defined functions to compare key values) and return the intersection:

 <?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_uintersect ( $a1 , $a2 , "myfunction" ) ;
print_r ( $result ) ;
?>

Try it yourself

Example 2

Compare the key values of three arrays (using user-defined functions to compare key values) and return the intersection:

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

$a1 = array ( "a" => "red" , "b" => "green" , "c" => "blue" , "yellow" ) ;
$a2 = array ( "A" => "red" , "b" => "GREEN" , "yellow" , "black" ) ;
$a3 = array ( "a" => "green" , "b" => "red" , "yellow" , "black" ) ;

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

Try it yourself