3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $x = ''; $$x = 'empty'; var_dump( $'' );
based on Wdrs6
Output for 5.4.0 - 5.4.34
Parse error: syntax error, unexpected '''' (T_CONSTANT_ENCAPSED_STRING), expecting variable (T_VARIABLE) or '$' in /in/U6Osl on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting T_VARIABLE or '$' in /in/U6Osl on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting T_VARIABLE or '$' in /in/U6Osl on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/U6Osl on line 4
Process exited with code 255.