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run code in 150+ php & hhvm versions
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<?php echo "<form method='POST' action='" . "<?php echo \$_SERVER['PHP_SELF'];?>'>";
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
<form method='POST' action='<?php echo $_SERVER['PHP_SELF'];?>'>