phpjs/experimental/language/php_user_filter.js

php.js offers community built php functions in javascript

function php_user_filter() {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // %          note 1: To be extended on class refererenced in second argument of stream_filter_register()
  // *     example 1: var f = new php_user_filter();
  // *     example 1: f.filtername;
  // *     returns 1: ''

  this.filtername = '';
  this.params = '';

}
php_user_filter.prototype = {
  constructor: php_user_filter,
  filter: function($in, out, consumed, closing) { //  resource, resource, int reference, bool; returns int
    if (closing) {
      this.stream = ''; // ?
    }
    return null;
  },
  onCreate: function() { // returns bool
    return null;
  },
  onClose: function() {
    return null;
  }
};