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<?php $s="a(bcdefghijkl(mno)p)q"; $return = preg_replace_callback( '|(\((.+)\))+|', function ($matches) { return $matches[2]; }, $s ); print_r($return)
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.1.6
Parse error: syntax error, unexpected end of file in /in/UMCor on line 11
Process exited with code 255.
Output for hhvm-3.15.4
Fatal error: Uncaught Error: syntax error, unexpected $end in /in/UMCor:11 Stack trace: #0 {main}
Process exited with code 255.