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run code in 300+ PHP versions simultaneously
<?php $test1='First Monday of Januari 2014'; var_dump(strtotime($test1)); $test2='First Monday of January 2014'; var_dump(strtotime($test2));
Output for 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 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
bool(false) int(1388962800)
Output for 7.3.32 - 7.3.33, 8.0.13
bool(false) int(1388966400)
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
bool(false) bool(false)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5
int(-1) int(-1)

preferences:
271.69 ms | 402 KiB | 311 Q