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run code in 300+ PHP versions simultaneously
<?php echo "<form method='POST' action='" . "<?php echo \$_SERVER['PHP_SELF'];?>'>"; echo "<form method='POST' action='" . '<?php echo $_SERVER[\'PHP_SELF\'];?>\'>'; echo '<form method="POST" action="<?php echo $_SERVER[\'PHP_SELF\'];?>">';
Output for git.master, git.master_jit, rfc.property-hooks
<form method='POST' action='<?php echo $_SERVER['PHP_SELF'];?>'><form method='POST' action='<?php echo $_SERVER['PHP_SELF'];?>'><form method="POST" action="<?php echo $_SERVER['PHP_SELF'];?>">

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