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    \$\begingroup\$ This can be further simplified as: <?unlink(__FILE__);, the trailing ?> is not required \$\endgroup\$ Commented Jun 8, 2014 at 3:54
  • \$\begingroup\$ You have to start with <?= or the start tag is not recognized. \$\endgroup\$ Commented Jun 8, 2014 at 12:13
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    \$\begingroup\$ PHP destroying itself...ha! E_NOTICE line 3048 \$\endgroup\$ Commented Jun 8, 2014 at 15:46
  • \$\begingroup\$ <?+space is also ok. You just cannot use a letter after the short tag. \$\endgroup\$ Commented Jan 17, 2017 at 2:56
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    \$\begingroup\$ You can save one more byte by naming the file. <?=unlink("a.php"); \$\endgroup\$ Commented Jun 22, 2021 at 17:14