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

Process exited with code 153.