3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = <<<EOT <?xml version="1.0"?> <!DOCTYPE results [<!ENTITY harmless "completely harmless">]> <results> <result>This result is &harmless;</result> </results> EOT; echo $a;
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
<?xml version="1.0"?> <!DOCTYPE results [<!ENTITY harmless "completely harmless">]> <results> <result>This result is &harmless;</result> </results>

preferences:
164.45 ms | 403 KiB | 175 Q