Replace one character in a string with a correlating item in an array of replacements

strReplaceArr.js

//Before now or writing your own function you could only do String.prototype.replacewith a search and a replacement,
//or an array of searches to be repalced with their matching item in an array of replacements.
//Meaning you couldn't do something like replace all question marks in `cake ? pie ? noodles` with a matching
//item in an array of replacements, like this: `thatString.replace("?", ["meat","veggies"])` and get something like
//`cake meat pie veggies noodles`, but now you can! :D (note: number of occurences of search must match count() of $replace)
//"?no?".replaceArray("?", ["s","w"]) //returns `snow`

if (!String.prototype.replaceArray) {
  String.prototype.replaceArray = function(find, replace) {
    var x = 0
    var n = 0
    var str = ""
    var string = this.split(find)
    string.forEach(function(s) {
      if (n > 0) {
        str += replace[x] + s
        x += 1
      } else {
        str += s
      }
      n += 1
    })
    return str
  }
}

strReplaceArr.php

<?php

#Before now or writing your own function you could only do str_replace() with a search and a replacement,
#or an array of searches to be repalced with their matching item in an array of replacements.
#Meaning you couldn't do something like replace all question marks in `cake ? pie ? noodles` with a matching
#item in an array of replacements, like this: `str_replace("?", ["meat","veggies"], $thatString)` and get something like
#`cake meat pie veggies noodles`, but now you can! :D (note: number of occurences of search must match count() of $replace)
#str_replace_arr("?", ["s","w"], "?no?") #returns `snow`

function str_replace_arr ($find, $replace, $string) {
  $x = 0;
  $n = 0;
  $str = '';
  $string = explode($find, $string);
  foreach ($string as $s) {
    if ($n > 0) {
      $str .= $replace[$x].$s;
      $x += 1;
    } else {
      $str .= $s;
    }
    $n += 1;
  }
  return $str;
}