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run code in 200+ php & hhvm versions
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<?php $func = function($i){$ob='';for( $j = 0; $j<$i; $ob.='Smile!', $j++ );echo $ob."\n"; }; for($i = 3; $i > 0; call_user_func($func,$i), $i--);
based on O9HeQ
Output for 5.3.0 - 7.2.0
Smile!Smile!Smile! Smile!Smile! Smile!
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/R6Hhe on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/R6Hhe on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/R6Hhe on line 3
Process exited with code 255.