Get index of element in an array by the value

Question

I have this array in PHP:

array(
    [0] => array( \'username\' => \'user1\' )
    [1] => array( \'username\' => \'user2\' )
)

Answer 1

This would be very simple

private function getArrayKey($haystack, $needle)
{
  foreach($haystack as $key => $product)
  {
     if ($product['id'] === $needle)
     return $key;
  }

  return false;
}