3v4l.org

run code in 300+ PHP versions simultaneously
<?php define('CONSTANT',1); define('_CONSTANT',0); define('EMPTY',''); if(!empty(EMPTY)) { if(!(boolean) _CONSTANT) { print "one"; } }
Output for 5.4.0 - 5.4.25
Parse error: syntax error, unexpected 'EMPTY' (T_EMPTY) in /in/vHZGZ on line 6
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_EMPTY in /in/vHZGZ on line 6
Process exited with code 255.
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