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<?php $regex = '~ (?P<function_name>.*?)\s*(?P<parameters>\(.*?\))\s*~six'; preg_match($regex, 'printr(abc,assdd)', $matches); print_r($matches);
Output for 4.3.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => printr(abc,assdd) [function_name] => printr [1] => printr [parameters] => (abc,assdd) [2] => (abc,assdd) )
Output for 4.3.0 - 4.3.2
Array ( [0] => printr(abc,assdd) [1] => printr [2] => (abc,assdd) )