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<?$a='<?$a="%s";printf(str_replace(chr(34),chr(39),$a),$a);?>'; printf(str_replace(chr(34),chr(39),$a),$a);?>
Output for 5.4.34 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
<?$a='<?$a="%s";printf(str_replace(chr(34),chr(39),$a),$a);?>';printf(str_replace(chr(34),chr(39),$a),$a);?>
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.4.32
<?$a='<?$a="%s";printf(str_replace(chr(34),chr(39),$a),$a);?>'; printf(str_replace(chr(34),chr(39),$a),$a);?>