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<?phpecho strlen(<<<HERE123HERE);
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34
Parse error: syntax error, unexpected 'strlen' (T_STRING) in /in/mEXFL on line 1
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?phpecho strlen(<<<HERE123HERE);