<?php
$real = array(-7.8, 0, 0.1, 0.3, 1, 1.1, 55.1);
$result = trader_floor($real);
var_dump($result);
/*
array(7) {
  [0]=>
  float(-8)
  [1]=>
  float(0)
  [2]=>
  float(0)
  [3]=>
  float(0)
  [4]=>
  float(1)
  [5]=>
  float(1)
  [6]=>
  float(55)
}
*/