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run code in 300+ PHP versions simultaneously
<?php $a = [ is_numeric('0e1'), is_numeric('1e1'), is_numeric('0x1'), is_numeric('0'), ]; foreach ($a as $i): var_dump($i); endforeach;
Output for 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
bool(true) bool(true) bool(false) bool(true)
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
bool(true) bool(true) bool(true) bool(true)

preferences:
211.81 ms | 402 KiB | 267 Q