3v4l.org

run code in 300+ PHP versions simultaneously
<?php $api_key = array( '29301333' => 'aaaa', '29301334' => 'aaaabbbb', ) echo $api_key[null] ?>
Output for 5.4.0 - 5.4.11
Parse error: syntax error, unexpected 'echo' (T_ECHO) in 9htgU on line 6
Process exited with code 255.
Output for 5.3.0 - 5.3.21
Parse error: syntax error, unexpected T_ECHO in 9htgU on line 6
Process exited with code 255.
preferences:
174.8 ms | 1395 KiB | 41 Q