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<?php $string = "//define('ID', '');"; $tokens = token_get_all("<?php $string"); if ($tokens[1][0] == T_COMMENT) { echo 'comment'; } else { echo 'nope'; }
Output for 4.4.2 - 4.4.9, 5.1.2 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
comment
Output for 5.1.1
nope
Output for 5.1.0

Process exited with code 137.
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Notice: Undefined offset: 1 in /in/GbiI4 on line 7 nope
preferences:
216.2 ms | 402 KiB | 315 Q