Php inner join array

Php array join

$arr = array('Hello','World!','Beautiful','Day!');
echo join(", ",$arr);

Source: php.net

Php inner join array

$array1 = [1, 5, 64, 2, 6];
$array2 = [2, 1, 8, 3];

//Method 1:
array_filter($array1, function($_){
    global $array2;
  return in_array($_, $array2);
}); // Output: [0 => 1, 3 => 2]

//Method 2:
array_intersect($array1, $array2); //Output: [0 => 1, 3 => 2]

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