- str_replace: documentation ( source)
<?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);