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run code in 200+ php & hhvm versions
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<?php echo "\u{a}"; echo "\u{0000aa}"; echo "\u{9999}";
based on ELX1t
Output for 7.0.0 - 7.2.0
ª香
Output for 5.3.20 - 5.6.28
\u{a}\u{0000aa}\u{9999}