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<?php $value = '4+3(4-2)(1+2)'; $search = ['1(', '2(', '3(', '4(', '5(', '6(', '7(', '8(', '9(', '0(', ')(']; $replace = ['1*(', '2*(', '3*(', '4*(', '5*(', '6*(', '7*(', '8*(', '9*(', '0*(', ')*(']; echo str_replace($search, $replace, $value);

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38.16 ms | 402 KiB | 5 Q