3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $i = 1000; $start = microtime(true); while ($i--) uniqid(""); $elapsed = microtime(true) - $start; printf("less_entropy: %d\n", $elapsed * 1000); $i = 1000; $start = microtime(true); while ($i--) uniqid("", true); $elapsed = microtime(true) - $start; printf("more_entropy: %d\n", $elapsed * 1000);
Output for 7.2.0
less_entropy: 1 more_entropy: 1
Output for 5.4.4, 5.4.25, 5.4.27 - 5.4.30, 5.4.32 - 5.4.37, 5.4.39 - 5.4.40, 5.5.9 - 5.5.14, 5.5.18 - 5.5.19, 5.5.21 - 5.5.23, 5.6.0 - 5.6.1, 5.6.3 - 5.6.8, 5.6.19, 5.6.25, 7.1.7
less_entropy: 53 more_entropy: 0
Output for 5.1.1, 5.1.3, 5.5.5, 7.0.5, 7.0.14, 7.1.0, 7.1.6
less_entropy: 56 more_entropy: 0
Output for 4.3.3, 4.4.4, 5.0.0, 5.0.3 - 5.0.4, 5.1.4, 5.1.6, 5.2.3 - 5.2.4, 5.2.8, 5.2.11, 5.2.13, 5.2.17, 5.3.2, 5.3.6, 5.3.20, 5.3.22 - 5.3.26, 5.4.0 - 5.4.2, 5.4.6, 5.4.10 - 5.4.11, 5.4.14 - 5.4.16, 5.4.20, 5.4.23, 5.5.1, 5.5.3, 5.5.31, 5.5.37, 5.6.15, 5.6.22 - 5.6.23, 7.0.2, 7.0.8 - 7.0.9, 7.1.5
less_entropy: 55 more_entropy: 0
Output for 4.3.5, 4.3.9, 4.4.1 - 4.4.2, 4.4.6, 4.4.8, 5.2.7, 5.2.12, 5.3.8, 5.3.13, 5.3.17, 5.3.28, 5.4.3, 5.4.5, 5.4.7, 5.4.38, 5.4.42 - 5.4.43, 5.5.7, 5.6.12, 5.6.17, 7.0.3, 7.0.20
less_entropy: 55 more_entropy: 1
Output for 4.3.4, 5.1.0, 5.1.2, 5.2.0 - 5.2.2, 5.2.5, 5.2.16, 5.3.0 - 5.3.1, 5.3.3, 5.3.5, 5.3.7, 5.3.10 - 5.3.11, 5.3.14 - 5.3.16, 5.3.18 - 5.3.19, 5.3.27, 5.3.29, 5.4.9, 5.4.12 - 5.4.13, 5.4.18 - 5.4.19, 5.4.22, 5.4.24, 5.4.26, 5.4.31, 5.4.41, 5.4.44 - 5.5.0, 5.5.2, 5.5.4, 5.5.6, 5.5.8, 5.5.15, 5.5.20, 5.5.24 - 5.5.29, 5.5.32, 5.5.34 - 5.5.35, 5.6.2, 5.6.9 - 5.6.11, 5.6.13 - 5.6.14, 5.6.18, 5.6.20 - 5.6.21, 7.0.0 - 7.0.1, 7.0.4, 7.0.6 - 7.0.7, 7.0.10
less_entropy: 54 more_entropy: 0
Output for 4.3.0, 4.3.7, 4.3.10, 4.4.3, 4.4.5, 4.4.7, 5.2.6, 5.2.9, 5.2.15, 5.3.4, 5.3.21, 5.4.17, 5.4.21, 5.5.33, 5.5.36, 5.5.38, 5.6.28
less_entropy: 56 more_entropy: 1
Output for 5.3.12, 5.5.30, 5.6.16, 5.6.24
less_entropy: 57 more_entropy: 0
Output for 5.5.16
less_entropy: 53 more_entropy: 1
Output for 4.3.6, 4.4.0, 4.4.9, 5.0.1 - 5.0.2, 5.1.5, 5.2.10, 5.2.14, 5.3.9, 5.4.8
less_entropy: 57 more_entropy: 1
Output for 4.3.1, 4.3.8, 5.0.5
less_entropy: 59 more_entropy: 1
Output for 4.3.11
less_entropy: 56 more_entropy: 2
Output for 4.3.2
less_entropy: 58 more_entropy: 1