PHP Tutorial - PHP array_udiff_uassoc() Function

Definition

The array_udiff_uassoc() function uses two user-defined functions to compare the keys and values of two or more arrays, and returns the differences.

Syntax

PHP array_udiff_uassoc() Function has the following syntax.

array_udiff_uassoc(array1,array2,array3...,myfunction_key,myfunction_value)

Parameter

Parameter	Is Required	Description
array1	Required.	Array to compare from
array2	Required.	Array to compare against
array3,...	Optional.	More arrays to compare against
myfunction_key	Required.	User-defined function to compare the array keys.
myfunction_value	Required.	User-defined function to compare the array values.

myfunction_key and myfunction_value must return an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument.

Example

Uses two user-defined functions to compare the keys and values of two or more arrays, and returns the differences


<?php//www. ja va  2s  .  c om
function myfunction_key($a,$b){
    if ($a===$b){
      return 0;
    }
    return ($a>$b)?1:-1;
}

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

$a1=array("a"=>"A","b"=>"HTML","c"=>"java2s.com");
$a2=array("a"=>"Apple","b"=>"CSS","e"=>"PHP");

$result=array_udiff_uassoc($a1,$a2,"myfunction_key","myfunction_value");
print_r($result);
?>

The code above generates the following result.