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<?php $v = -0.1; var_dump((bool) $v); var_dump((int) $v); var_dump(abs($v));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(true) int(0) float(0.1)