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run code in 200+ php & hhvm versions
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<?php var_dump(strval(false)); var_dump(strval(null));
based on 9INji
Output for 5.6.0 - 5.6.30, hhvm-3.18.4 - 3.21.0, 7.0.0 - 7.3.0rc2
string(0) "" string(0) ""