---
layout: page
title: "JavaScript array_key_exists function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/array_key_exists:323
- /functions/view/array_key_exists
- /functions/view/323
- /functions/array_key_exists:323
- /functions/323
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's array_key_exists

{% codeblock array/array_key_exists.js lang:js https://raw.github.com/kvz/phpjs/master/functions/array/array_key_exists.js raw on github %}
function array_key_exists (key, search) {
  // From: http://phpjs.org/functions
  // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: Felix Geisendoerfer (http://www.debuggable.com/felix)
  // *     example 1: array_key_exists('kevin', {'kevin': 'van Zonneveld'});
  // *     returns 1: true
  // input sanitation
  if (!search || (search.constructor !== Array && search.constructor !== Object)) {
    return false;
  }

  return key in search;
}
{% endcodeblock %}

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

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

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


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