Find identical content between two arrays.

_match_array_content.php

<?php

/**
 * Find identical content between two arrays.
 *
 *
 * @param Array $first_array
 * @param Array $second_array
 * @return Array
 **/
function _match_array_content(Array $first_array, Array $second_array): Array
{
  $matches = array();
  foreach ($first_array as $value) {
    if (in_array($value, $second_array)) {
      array_push($matches, $value);
    }
  }

  return $matches;
}


// Test
$first="1,2,3,4,5,6,7,8,8,6";
$second="4,2,5,6,7,8,9";
$first=explode(',',$first);
$second=explode(',',$second);
var_dump(_compare_array_content($first, $second));


// Simpler method
var_dump(array_intersect($first, $second));