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<?php var_dump(count(null)); var_dump(count(false)); var_dump(count(true)); var_dump(count(0)); var_dump(count(1)); var_dump(count("hi")); var_dump(count(array())); var_dump(count(array(null)));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(0) int(1) int(1) int(1) int(1) int(1) int(0) int(1)