Answers for "php group items rows in array put into"

group array php by key

private function group_by($array, $key) {
      $return = array();
      
      foreach($array as $val) {
          $return[$val->$key][] = $val; 
	  //  ou para gettype($val) = array
	  //  $return[$val[$key]][] = $val; 
      }
      return $return;
  }

php group array by value and count

$colors=array("red","red","red","blue","green");
$colorsCount=array_count_values($colors);
print_r($colorsCount);
#Array
#(
#    [red] => 3
#    [blue] => 1
#    [green] => 1
#)