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run code in 150+ php & hhvm versions
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<?php var_dump( (int)(bool) 0, (int)(bool) "", (int)(bool) "0", (int) false, (string) false, (string) 0);
Output for 4.3.0 - 7.1.0
int(0) int(0) int(0) int(0) string(0) "" string(1) "0"