3v4l.org

run code in 300+ PHP versions simultaneously
<?php if (empty($mystring)) { echo 'empty'; } if ($mystring == null) { echo 'null; // and warning } if (!isset($mystring)) { echo 'not set'; }
Output for 5.4.0 - 5.4.29
Parse error: syntax error, unexpected 'not' (T_STRING), expecting ',' or ';' in /in/5L7dg on line 12
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_STRING, expecting ',' or ';' in /in/5L7dg on line 12
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING, expecting ',' or ';' in /in/5L7dg on line 12
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `','' or `';'' in /in/5L7dg on line 12
Process exited with code 255.
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