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run code in 150+ php & hhvm versions
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<?php var_dump(filter_var('foobar1+test1@gmail.com', FILTER_VALIDATE_EMAIL)); PHP_EOL; var_dump(filter_var('bad',FILTER_VALIDATE_EMAIL));
based on 1NsHV
Output for 5.2.0 - 5.3.9, 5.3.11 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(23) "foobar1+test1@gmail.com" bool(false)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.10

Process exited with code 137.
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function filter_var() in /in/JAShd on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: filter_var() in /in/JAShd on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: filter_var() in /in/JAShd on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: filter_var() in /in/JAShd on line 3