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run code in 200+ php & hhvm versions
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<?php echo Topic::class;
Output for 5.5.24 - 7.1.7, 7.1.20 - 7.2.6
Topic
Output for 7.1.10

Process exited with code 137.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /in/tnr5g on line 3
Process exited with code 255.