PHP's is_array in JavaScript

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

[ View on GitHub | Edit on GitHub | Source on GitHub ]

How to use

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


  • In Locutus, javascript objects are like php associative arrays, thus JavaScript objects will also return true in this function (except for objects which inherit properties, being thus used as objects), unless you do ini_set(‘locutus.objectsAsArrays’, 0), in which case only genuine JavaScript arrays will return true


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
1is_array(['Kevin', 'van', 'Zonneveld'])true
2is_array('Kevin van Zonneveld')false
3is_array({0: 'Kevin', 1: 'van', 2: 'Zonneveld'})true
4ini_set('locutus.objectsAsArrays', 0) is_array({0: 'Kevin', 1: 'van', 2: 'Zonneveld'})false
5is_array(function tmp_a (){ = 'Kevin' })false

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