phparraysmultidimensional-arrayintersection

Get values that occur in each row of a 2d array

From a function I am given a multidimensional array like this:

[
    [7, 18],
    [12, 7],
    [12, 7, 13],
]

I need to find duplicate values in the 3 arrays within the main array. For example, if value 7 repeats in the 3 arrays, return 7.

Solution 
  • <?php
$array = array(array(7,18), array(12,7), array(12, 7, 13));
$result = array();


$first = $array[0];
for($i=1; $i<count($array); $i++){
 $result = array_intersect ($first, $array[$i]);
 $first = $result;
}
print_r($result);//7
?>