3v4l.org

run code in 300+ PHP versions simultaneously
<?php $float = 0.0000000038; echo "float: $float\n"; $str = (string)$float; echo "string: $str\n"; $n_dec = strlen(substr(strrchr($str, '.'), 1)); echo "$n_dec\n"; echo number_format($float, $n_dec), "\n";
Output for 5.2.2 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
float: 3.8E-9 string: 3.8E-9 4 0.0000
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 - 5.2.1
float: 3.8E-09 string: 3.8E-09 5 0.00000

preferences:
272.6 ms | 402 KiB | 342 Q