- round: documentation ( source)
- print_r: documentation ( source)
- ini_set: documentation ( source)
<?php
echo print_r(0.1 + 0.2, true) . "\n";
echo "Old precision: " . ini_set("precision", -1) . "\n";
echo print_r(0.1 + 0.2, true) . "\n";
echo "Round with 14: " . print_r(round(0.1 + 0.2, 14), true);