phpjs/_octopress/source/functions/utf8_decode/index.markdown

php.js offers community built php functions in javascript

---
layout: page
title: "JavaScript utf8_decode function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/utf8_decode:576
- /functions/view/utf8_decode
- /functions/view/576
- /functions/utf8_decode:576
- /functions/576
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's utf8_decode

{% codeblock xml/utf8_decode.js lang:js https://raw.github.com/kvz/phpjs/master/functions/xml/utf8_decode.js raw on github %}
function utf8_decode (str_data) {
  // From: http://phpjs.org/functions
  // +   original by: Webtoolkit.info (http://www.webtoolkit.info/)
  // +      input by: Aman Gupta
  // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: Norman "zEh" Fuchs
  // +   bugfixed by: hitwork
  // +   bugfixed by: Onno Marsman
  // +      input by: Brett Zamir (http://brett-zamir.me)
  // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   bugfixed by: kirilloid
  // *     example 1: utf8_decode('Kevin van Zonneveld');
  // *     returns 1: 'Kevin van Zonneveld'

  var tmp_arr = [],
    i = 0,
    ac = 0,
    c1 = 0,
    c2 = 0,
    c3 = 0,
    c4 = 0;

  str_data += '';

  while (i < str_data.length) {
    c1 = str_data.charCodeAt(i);
    if (c1 <= 191) {
      tmp_arr[ac++] = String.fromCharCode(c1);
      i++;
    } else if (c1 <= 223) {
      c2 = str_data.charCodeAt(i + 1);
      tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));
      i += 2;
    } else if (c1 <= 239) {
      // http://en.wikipedia.org/wiki/UTF-8#Codepage_layout
      c2 = str_data.charCodeAt(i + 1);
      c3 = str_data.charCodeAt(i + 2);
      tmp_arr[ac++] = String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
      i += 3;
    } else {
      c2 = str_data.charCodeAt(i + 1);
      c3 = str_data.charCodeAt(i + 2);
      c4 = str_data.charCodeAt(i + 3);
      c1 = ((c1 & 7) << 18) | ((c2 & 63) << 12) | ((c3 & 63) << 6) | (c4 & 63);
      c1 -= 0x10000;
      tmp_arr[ac++] = String.fromCharCode(0xD800 | ((c1>>10) & 0x3FF));
      tmp_arr[ac++] = String.fromCharCode(0xDC00 | (c1 & 0x3FF));
      i += 4;
    }
  }

  return tmp_arr.join('');
}
{% endcodeblock %}

 - [Raw function on GitHub](https://github.com/kvz/phpjs/blob/master/functions/xml/utf8_decode.js)

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](https://medium.com/what-i-learned-building/9216e1c9da7d). We'll put online 
functions that are far from perfect, in the hopes to spark better contributions. 
Do you have one? Then please just: 

 - [Edit on GitHub](https://github.com/kvz/phpjs/edit/master/functions/xml/utf8_decode.js)

### Example 1
This code
{% codeblock lang:js example %}
utf8_decode('Kevin van Zonneveld');
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
'Kevin van Zonneveld'
{% endcodeblock %}


### Other PHP functions in the xml extension
{% render_partial _includes/custom/xml.html %}