3v4l.org

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 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
<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'];?>">
preferences:
275.86 ms | 406 KiB | 343 Q