3v4l.org

run code in 300+ PHP versions simultaneously
<?php for ($i = 0; $i < 20; $i++) { var_dump((log10($i % 10 + 1) * 30 + 1) / 2); }
Output for 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(0.5) float(5.015449934959718) float(7.656818820794936) float(9.530899869919436) float(10.984550065040283) float(12.172268755754654) float(13.176470600213852) float(14.046349804879153) float(14.813637641589873) float(15.5) float(0.5) float(5.015449934959718) float(7.656818820794936) float(9.530899869919436) float(10.984550065040283) float(12.172268755754654) float(13.176470600213852) float(14.046349804879153) float(14.813637641589873) float(15.5)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 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, 5.5.24 - 5.5.35, 5.6.8 - 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
float(0.5) float(5.0154499349597) float(7.6568188207949) float(9.5308998699194) float(10.98455006504) float(12.172268755755) float(13.176470600214) float(14.046349804879) float(14.81363764159) float(15.5) float(0.5) float(5.0154499349597) float(7.6568188207949) float(9.5308998699194) float(10.98455006504) float(12.172268755755) float(13.176470600214) float(14.046349804879) float(14.81363764159) float(15.5)

preferences:
256.16 ms | 405 KiB | 352 Q