PHP Tutorial - PHP array_diff_uassoc() function

Definition

The array_diff_uassoc() function compares the arrays with a user-defined function and returns the differences.

Syntax

PHP array_diff_uassoc() function has the following syntax.

array_diff_uassoc(array1,array2,array3...,myfunction);

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	Required.	A string that define a callable comparison function.

The comparison function must return an integer <, =, or > than 0 if the first argument is less than, equals, or greater than the second argument

Example

Compare the keys and values of two arrays use a user-defined function to compare the keys, and return the differences:


<?php//from w w  w.  j a v a 2s .c o m
function myfunction($a,$b){
    if ($a===$b){
      return 0;
    }
    return ($a>$b)?1:-1;
}

$a1=array("a"=>"A","b"=>"B","c"=>"C");
$a2=array("d"=>"D","b"=>"B","e"=>"E","j"=>"java2s.com");

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

The code above generates the following result.