Intersect unknown number of arrays in PHP

php arrays loops array-intersect
Swader picture Swader · Mar 22, 2011 · Viewed 7.5k times · Source

I'm trying to intersect an arbitrary number of PHP arrays, the count of which depends on a user provided parameter, each of which can have any number of elements.

For example: array1(1, 2, 3, 4, 5) array2(2, 4, 6, 8, 9, 23) array3(a, b, 3, c, f) ... arrayN(x1, x2, x3, x4, x5 ... xn)

Since array_intersect takes a list of params, I can't build one array of arrays to intersect and have to work my way around this. I tried this solution: http://bytes.com/topic/php/answers/13004-array_intersect-unknown-number-arrays but this did not work, as an error is reported that array_intersect requires 2 or more params.

Does anyone have any idea how to approach this in a manner as simple as possible?

Answer

Mark Baker picture Mark Baker · Mar 22, 2011

Create a new empty array, add each of your arrays to that, then use call_user_func_array()

$wrkArray = array( $userArray1,
                   $userArray2,
                   $userArray3
                 );
$result = call_user_func_array('array_intersect',$wrkArray);

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