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run code in 150+ php & hhvm versions
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<?php $search = htmlentities("this();|apple/\0"); echo "/" . $search . "/"; echo "\n"; if (strpos($search, 'apple') !== false) { echo preg_replace("/" . $search . "/", $search . " <img src='" . $search . ".png'>", "apple"); } elseif (strpos($search, 'orange') !== false) { echo preg_replace("/" . $search . "/", $search . " <img src='" . $search . ".png'>", "orange"); } elseif (strpos($search, 'banana') !== false) { echo preg_replace("/" . $search . "/", $search . " <img src='" . $search . ".png'>", "banana"); } elseif (strpos($search, 'kiwi') !== false) { echo preg_replace("/" . $search . "/", $search . " <img src='" . $search . ".png'>", "kiwi"); } else echo "Please search for apple, orange, banana, or kiwi.";
Output for 5.4.7 - 5.6.28, 7.0.0 - 7.1.0
/this();|apple// Warning: preg_replace(): Null byte in regex in /in/mnu8a on line 7
Output for hhvm-3.12.0
/this();|apple// Fatal error: Error: Null byte found in pattern in /in/mnu8a on line 7
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.4.6
/this();|apple// this();|apple/ <img src='this();|apple/.png'>