3v4l.org

run code in 300+ PHP versions simultaneously
<?php $value = 1.0; $v = explode('.', $value); $p = 0; for ($i = 0; $i < strlen($v[1]); $i++) { if (substr($v[1], $i, 1) > 0) { $p = $i+1; } } print round($value, $p);

preferences:
46.66 ms | 402 KiB | 5 Q