php - distribute a number without remainder -

i want distribute item specific pieces without cutting excess piece, example:

$persons = 7; $rooms = 2;  for($i = 0; $i < $rooms; $i++) {       //distribute persons per room }  //the endpoint should $the_room[0] = 4 //instead of 3.5 $the_room[1] = 3 //instead of 3.5 

how approach first equally distributes pieces, randomises remainder?

$persons = 7; $rooms = 2; $the_room = array();  for($i = 0; $i < $rooms; $i++) {   $the_room[$i] = floor($persons / $rooms); }  // random distribution while( $persons - array_sum($the_room) > 0) {   $the_room[array_rand($the_room)]++; }  // sequential distribution // $index = 0; // while( $persons - array_sum($the_room) > 0) // { //   $the_room[$index++]++; // }  print_r($the_room);