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run code in 150+ php & hhvm versions
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<?php $f = false; var_dump("$f"); $f = null; var_dump("$f"); $f = 0; var_dump("$f"); $f = ''; var_dump("$f");
Output for 4.3.0 - 7.1.0
string(0) "" string(0) "" string(1) "0" string(0) ""