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run code in 150+ php & hhvm versions
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<?php $x = "1292E-1x"; var_dump((float)$x); var_dump((int)$x);
Output for 7.1.0
float(129.2) int(129)
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.0.14
float(129.2) int(1292)
Output for hhvm-3.10.0

Process exited with code 153.