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run code in 200+ php & hhvm versions
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<?php var_dump((int)(bool) 23, (int)(bool) "23", (int)true); var_dump((int)(bool) 0, (int)(bool) "", (int)false);
Output for 4.3.0 - 7.1.7
int(1) int(1) int(1) int(0) int(0) int(0)