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JavaScript str_replace function

A JavaScript equivalent of PHP’s str_replace

strings/str_replace.js raw on github
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function str_replace(search, replace, subject, count) {
  //  discuss at: http://phpjs.org/functions/str_replace/
  // original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // improved by: Gabriel Paderni
  // improved by: Philip Peterson
  // improved by: Simon Willison (http://simonwillison.net)
  // improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // improved by: Onno Marsman
  // improved by: Brett Zamir (http://brett-zamir.me)
  //  revised by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)
  // bugfixed by: Anton Ongson
  // bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // bugfixed by: Oleg Eremeev
  //    input by: Onno Marsman
  //    input by: Brett Zamir (http://brett-zamir.me)
  //    input by: Oleg Eremeev
  //        note: The count parameter must be passed as a string in order
  //        note: to find a global variable in which the result will be given
  //   example 1: str_replace(' ', '.', 'Kevin van Zonneveld');
  //   returns 1: 'Kevin.van.Zonneveld'
  //   example 2: str_replace(['{name}', 'l'], ['hello', 'm'], '{name}, lars');
  //   returns 2: 'hemmo, mars'

  var i = 0,
    j = 0,
    temp = '',
    repl = '',
    sl = 0,
    fl = 0,
    f = [].concat(search),
    r = [].concat(replace),
    s = subject,
    ra = Object.prototype.toString.call(r) === '[object Array]',
    sa = Object.prototype.toString.call(s) === '[object Array]';
  s = [].concat(s);
  if (count) {
    this.window[count] = 0;
  }

  for (i = 0, sl = s.length; i < sl; i++) {
    if (s[i] === '') {
      continue;
    }
    for (j = 0, fl = f.length; j < fl; j++) {
      temp = s[i] + '';
      repl = ra ? (r[j] !== undefined ? r[j] : '') : r[0];
      s[i] = (temp)
        .split(f[j])
        .join(repl);
      if (count && s[i] !== temp) {
        this.window[count] += (temp.length - s[i].length) / f[j].length;
      }
    }
  }
  return sa ? s : s[0];
}

Please note that php.js uses JavaScript objects as substitutes for PHP arrays, they are the closest match to this hashtable-like data structure.

Please also note that php.js offers community built functions and goes by the McDonald’s Theory. We’ll put online functions that are far from perfect, in the hopes to spark better contributions. Do you have one? Then please just:

Other PHP functions in the strings extension

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