PHP's convert_cyr_string in JavaScript

Here’s what our current JavaScript equivalent to PHP's convert_cyr_string looks like.

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How to use

You you can install via npm install locutus and require it via require('locutus/php/strings/convert_cyr_string'). You could also require the strings module in full so that you could access strings.convert_cyr_string instead.

If you intend to target the browser, you can then use a module bundler such as Browserify, webpack or rollup.js.


This function targets ES5, but as of Locutus 2.0.2 we also support ES6 functions. Locutus transpiles to ES5 before publishing to npm.

A community effort

Not unlike Wikipedia, Locutus is an ongoing community effort. Our philosophy follows The McDonald’s Theory. This means that we don't consider it to be a bad thing that many of our functions are first iterations, which may still have their fair share of issues. We hope that these flaws will inspire others to come up with better ideas.

This way of working also means that we don't offer any production guarantees, and recommend to use Locutus inspiration and learning purposes only.


  • Assumes and converts to Unicode strings with character code equivalents of the same numbers as in the from or target character set; Note that neither the input or output should be treated as actual Unicode, since the PHP function this is original by does not either One could easily represent (or convert the results) of a string form as arrays of code points instead but since JavaScript currently has no clear binary data type, we chose to use strings as in PHP


Please note that these examples are distilled from test cases that automatically verify our functions still work correctly. This could explain some quirky ones.

#codeexpected result
1convert_cyr_string(String.fromCharCode(214), 'k', 'w').charCodeAt(0) === 230; // Char. 214 of KOI8-R gives equivalent number value 230 in win1251true

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