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run code in 150+ php & hhvm versions
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<?php $filename = urldecode("aaaa.dd%00..cc"); var_dump(pathinfo($filename));
based on mhRoY
Output for 5.2.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(4) { ["dirname"]=> string(1) "." ["basename"]=> string(12) "aaaa.dd..cc" ["extension"]=> string(2) "cc" ["filename"]=> string(9) "aaaa.dd." }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.1.6
array(3) { ["dirname"]=> string(1) "." ["basename"]=> string(12) "aaaa.dd..cc" ["extension"]=> string(7) "dd..cc" }
Output for 4.3.0 - 4.4.9
array(3) { ["dirname"]=> string(1) "." ["basename"]=> string(7) "aaaa.dd" ["extension"]=> string(2) "dd" }