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run code in 150+ php & hhvm versions
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<?php echo "<!DOCTYPE HTML>\n"; echo "<html>"; echo "<body>"; echo "<h1>Test</h1>"; echo "</body>"; echo "</html>"; ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
<!DOCTYPE HTML> <html><body><h1>Test</h1></body></html>