PHP array_diff_assoc() function

PHP Array Functions

Example

Compare the keys and values of two arrays and return the difference set:

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("a"=>"red","b"=>"green","c"=>"blue");
$result=array_diff_assoc($a1,$a2);
print_r($result);
?>

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Definition and Usage

The array_diff_assoc() function is used to compare the keys and values of two (or more) arrays and return the difference set.

This function compares the keys and values of two (or more) arrays and returns a difference set array that includes all the elements inarray1) but not in any other parameter array (array2 or array3 etc.) of keys and values.

Syntax

array_diff_assoc(array1,array2,array3...);
Parameters Description
array1 Required. The first array to compare with other arrays.
array2 Required. The array to compare with the first array.
array3,... Optional. Other arrays to compare with the first array.

Technical Details

Return Value: Returns an array that contains all the elements in array1 but not in any other parameter array (array2 or array3 etc.) of keys and values.
PHP Version: 4.3+

More Examples

Example 1

Compare the keys and values of two arrays and return the difference set:

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"green","g"=>"blue");
$result=array_diff_assoc($a1,$a2);
print_r($result);
?>

Run Instances

Example 2

Compare the keys and values of three arrays and return the difference set:

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("a"=>"red","f"=>"green","g"=>"blue");
$a3=array("h"=>"red","b"=>"green","g"=>"blue");
$result=array_diff_assoc($a1,$a2,$a3);
print_r($result);
?>

Run Instances

PHP Array Functions