- var_dump: documentation ( source)
<?php
var_dump(0.1 + 0.2 + 0.3 == 0.1 + (0.2) + 0.3);
var_dump(0.1 + 0.2 + 0.3 == (0.1 + 0.2) + 0.3);
var_dump(0.1 + 0.2 + 0.3 == 0.1 + (0.2 + 0.3));
var_dump((0.1 + 0.2) + 0.3 == 0.1 + 0.2 + 0.3);
var_dump((0.1 + 0.2) + 0.3 == 0.1 + (0.2 + 0.3));