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run code in 150+ php & hhvm versions
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<?php function replace($string) { return preg_replace_callback('/(?<tag>(?<enter><)?!(?<level>\d+)!(?<leave>>)?)/', function ($match) { $level = (int) $match['level']; $enter = !empty($match['enter']); $leave = !empty($match['leave']); if ($enter === $leave) { var_dump($match); return $match['tag']; } if ($level > 0) { return vsprintf('%s!%d!%s', [ $enter ? '<' : null, $level - 1, $leave ? '>' : null, ]); } return vsprintf('%s?%s', [ $enter ? '<' : null, $leave ? '>' : null, ]); }, $string); } $string = '<!3!= "<!2!= "<!1!= "<!0!= "noodles" !0!>" !1!>" !2!>" !3!>'; ob_start(); eval(sprintf('; ?>%s<?php ', replace($string))); $string = ob_get_clean(); echo $string . PHP_EOL; ob_start(); eval(sprintf('; ?>%s<?php ', replace($string))); $string = ob_get_clean(); echo $string . PHP_EOL; ob_start(); eval(sprintf('; ?>%s<?php ', replace($string))); $string = ob_get_clean(); echo $string . PHP_EOL; ob_start(); eval(sprintf('; ?>%s<?php ', replace($string))); $string = ob_get_clean(); echo $string . PHP_EOL;
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
<!2!= "<!1!= "<!0!= "noodles" !0!>" !1!>" !2!> <!1!= "<!0!= "noodles" !0!>" !1!> <!0!= "noodles" !0!> noodles
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/PJktm on line 16
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/PJktm on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/PJktm on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/PJktm on line 5
Process exited with code 255.