---
layout: page
title: "JavaScript runkit_function_copy function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/runkit_function_copy:823
- /functions/view/runkit_function_copy
- /functions/view/823
- /functions/runkit_function_copy:823
- /functions/823
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's runkit_function_copy

{% codeblock runkit/runkit_function_copy.js lang:js https://raw.github.com/kvz/phpjs/master/functions/runkit/runkit_function_copy.js raw on github %}
function runkit_function_copy (funcname, targetname) {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // %          note 1: Function can only be copied to and from the global context
  // *     example 1: function plus (a, b) { return (a + b); }
  // *     example 1: runkit_function_copy('plus', 'add');
  // *     returns 1: true
  if (typeof this.window[funcname] !== 'function' || this.window[targetname] !== undefined) { //  (presumably disallow overwriting existing variables)
    return false;
  }
  this.window[targetname] = this.window[funcname];
  return true;
}
{% endcodeblock %}

 - [view on github](https://github.com/kvz/phpjs/blob/master/functions/runkit/runkit_function_copy.js)
 - [edit on github](https://github.com/kvz/phpjs/edit/master/functions/runkit/runkit_function_copy.js)

### Example 1
This code
{% codeblock lang:js example %}
function plus (a, b) { return (a + b); }
runkit_function_copy('plus', 'add');
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
true
{% endcodeblock %}


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