Replace all occurences of char inside quotes on PHP

Question

How could I convert something like this:

\"hi (text here) and (other text)\" come (again)

To this:

\"hi \\(text here\\) and \\(         


        

Answer 1

Given the string

$str = '"hi (text here) and (other text)" come (again) "maybe (to)morrow?" (yes)';

Iterative method

 for ($i=$q=0,$res='' ; $i

But if you're a fan of recursion

 function rec($i, $n, $q) {
   global $str;
   if ($i >= $n) return '';
   $c = $str[$i];
   if ($c == '"') $q ^= 1;
   elseif ($q && ($c == '(' || $c == ')')) $c = '\\' . $c;
   return $c . rec($i+1, $n, $q);
 }

 echo rec(0, strlen($str), 0) . "\n";

Result:

"hi \(text here\) and \(other text\)" come (again) "maybe \(to\)morrow?" (yes)