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run code in 200+ php & hhvm versions
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<?php var_dump( trim(false) ); var_dump( trim(null) ); var_dump( trim(0.00) ); var_dump( trim(0111.00) );
Output for 4.3.0 - 7.1.7
string(0) "" string(0) "" string(1) "0" string(3) "111"