3v4l.org

run code in 300+ PHP versions simultaneously
<?php $mynumber = (float) "3.8e-7"; var_dump($mynumber); printf('%F', $mynumber);
Output for 4.3.10 - 4.3.11, 4.4.0 - 4.4.9, 5.0.3 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
float(3.8E-7) 0.000000
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.2
float(3.8E-7)

preferences:
298.83 ms | 401 KiB | 396 Q