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<?php $string = '(2 * 10 + 5) Euro and (10 + 2) cents'; $regex = '#\((([^()]+|(?R))*)\)#'; if (preg_match_all($regex, $string ,$matches)) { $eqs = $matches[1]; foreach($eqs as $frm) { $frm_eval = eval("return $frm;"); $string = str_replace($frm, $frm_eval, $string); } echo $string; } else { //no parenthesis echo $string; }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
(25) Euro and (12) cents
preferences:
241.73 ms | 406 KiB | 312 Q