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run code in 200+ php & hhvm versions
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<?php var_dump(trim(''), trim(null), trim(false), trim(true), trim(0)); var_dump(trim(0) == null);
based on NkoD5
Output for 4.3.0 - 7.2.0
string(0) "" string(0) "" string(0) "" string(1) "1" string(1) "0" bool(false)