php array unique on two arrays

Question

Two PHP arrays:

$array1 = array(1,2,3,4,5);
$array2 = array(1,2,3,4,5,6,7,8,9,10);

Now how can I end up with an array like this:

$array3 = array(6,7,8,9,10);

Jon · Accepted Answer · 2012-07-11 10:32:23Z

6

With array_diff:

$array3 = array_diff($array2, $array1);

answered Jul 11, 2012 at 10:32

Jon

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2 Comments

dan-lee Over a year ago

But beware the sequence: array_diff($array1, $array2); would return an empty array!

Jon Over a year ago

@DanLee: IMHO that's not that sneaky a trap because "taking the difference" (e.g. subtraction) is generally a non-commutative operation.

Jeffrey Monte · Accepted Answer · 2012-07-11 10:33:57Z

0

use array_diff

$array3 = array_diff($array2, $array1)

answered Jul 11, 2012 at 10:33

Jeffrey Monte

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Comments

dan-lee · Accepted Answer · 2012-07-11 10:46:42Z

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As array_diff returns a relative complement you can use this code for a full diff, where it doesn't matter on which side the diff should be made:

$array3 = array_diff(array_merge($array1, $array2), array_intersect($array1, $array2));

answered Jul 11, 2012 at 10:46

dan-lee

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Comments

bool.dev · Accepted Answer · 2012-07-11 11:04:07Z

0

$array1 = array(1,2,3,4,5);
$array2 = array(1,2,3,4,5,6,7,8,9,10);

$output = array_merge(array_diff($array1, $array2), array_diff($array2, $array1));
print_r($output);

Output:

Array ( [0] => 6 [1] => 7 [2] => 8 [3] => 9 [4] => 10 )

edited Jul 11, 2012 at 11:04

bool.dev

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answered Jul 11, 2012 at 10:51

Bikash Ranjan

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