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run code in 150+ php & hhvm versions
Bugs & Features
<?php echo 'count(false) ',count(false),"\n"; echo 'count(0) ',count(0),"\n"; echo 'count(array(false)) ',count(array(false)),"\n"; echo 'count(array(0)) ',count(array(0)),"\n"; echo 'count(null) ',count(null),"\n"; echo 'count(array()): ',count(array()),"\n"; class Test {} $t = new Test(); echo 'count($t) ', count($t), "\n"; // not empty; see below: echo 'empty(null)', empty(null), "\n"; echo 'empty(array():',empty(array()),"\n"; // obj w/no properties not empty PHP5+ echo 'empty($t)',empty($t),"\n";
Output for 5.5.24 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
count(false) 1 count(0) 1 count(array(false)) 1 count(array(0)) 1 count(null) 0 count(array()): 0 count($t) 1 empty(null)1 empty(array():1 empty($t)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected ')', expecting :: (T_PAAMAYIM_NEKUDOTAYIM) in /in/NDpff on line 15
Process exited with code 255.
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected ')', expecting T_PAAMAYIM_NEKUDOTAYIM in /in/NDpff on line 15
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected ')', expecting T_PAAMAYIM_NEKUDOTAYIM in /in/NDpff on line 15
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_VARIABLE or '$' in /in/NDpff on line 15
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_VARIABLE or '$' in /in/NDpff on line 15
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/NDpff on line 15
Process exited with code 255.