Find common values in multiple arrays with PHP

Question

I need to find common values in multiple arrays. Number of arrays may be infinite. Example (output from print_r)

Array1
(
    [0] => 118
    [1] => 802
    [2] => 800
)
Array2
(
    [0] => 765
    [1] => 801
)
Array3
(
    [0] => 765 
    [1] => 794
    [2] => 793
    [3] => 792
    [4] => 791
    [5] => 799
    [6] => 801
    [7] => 802
    [8] => 800
)

now, I need to find the values that are common on all 3 (or more if available) of them.... how do I do that?

Thanx

Just for kicks: there are no common elements in these three arrays. — BoltClock
– BoltClock, Commented Mar 14, 2011 at 14:04

NullUserException · Accepted Answer · 2011-11-13 16:47:15Z

58

array_intersect()

$intersect = array_intersect($array1,$array2,$array3);

If you don't know how many arrays you have, then build up an array of arrays and user call_user_func_array()

$list = array();
$list[] = $array1;
$list[] = $array2;
$list[] = $array3;
$intersect = call_user_func_array('array_intersect',$list);

edited Nov 13, 2011 at 16:47

NullUserException

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answered Mar 14, 2011 at 14:03

Mark Baker

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6 Comments

mspir Over a year ago

Hi, I thought array_intersect only checks the first array against the others, or did I understood something wrong from the manual... trying now...

Mark Baker Over a year ago

It does, check the first array against all the others. From your description, you want the entries that are in all of the passed arrays. This is what array_intersect does. If an entry isn't in the first array, it doesn't care whether it's in the others.

Satish Ravipati Over a year ago

what if there is 801 in first array and 801 removed from 3rd array ?? array_intersect() will still return 801 which is common element in all arrays ??

Mark Baker Over a year ago

If 801 is removed from the 3rd array, then it is no longer a common element in all arrays

Oliver M Grech Over a year ago

For the sake of simplicity, to be in the returned array, a value must be present in all of the 3 arrays...

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