<?php
printf("Rating: %g\n", 4.00);
printf("Rating: %g\n", 4.20);
printf("Rating: %g\n", 4.02);
echo 4.00, PHP_EOL;
echo 4.20, PHP_EOL;
echo 4.02, PHP_EOL;

Rating: 4
Rating: 4.2
Rating: 4.02
4
4.2
4.02