---
warning: 'This file is auto generated by `npm run web:inject`, do not edit by hand'
examples:
  - |-
    var odd = function (num) {return (num & 1);}
    array_filter({"a": 1, "b": 2, "c": 3, "d": 4, "e": 5}, odd)
  - |-
    var even = function (num) {return (!(num & 1));}
    array_filter([6, 7, 8, 9, 10, 11, 12], even)
  - >-
    array_filter({"a": 1, "b": false, "c": -1, "d": 0, "e": null, "f":'',
    "g":undefined})
estarget: es5
returns:
  - '{"a": 1, "c": 3, "e": 5}'
  - '[ 6, , 8, , 10, , 12 ]'
  - '{"a":1, "c":-1}'
dependencies: []
authors:
  original by:
    - 'Brett Zamir (http://brett-zamir.me)'
  improved by:
    - 'Brett Zamir (http://brett-zamir.me)'
  input by:
    - max4ever
notes:
  - 'Takes a function as an argument, not a function''s name'
type: function
layout: function
title: PHP's array_filter in JavaScript
description: >-
  Here’s what our current JavaScript equivalent to <a
  href="http://php.net/manual/en/function.array-filter.php">PHP's
  array_filter</a> looks like.
function: array_filter
category: array
language: php
permalink: php/array/array_filter/
alias:
  - /functions/php/array_filter/
  - /functions/array/array_filter/
  - /php/array_filter/
  - /functions/array_filter/
---
{% codeblock lang:javascript %}module.exports = function array_filter (arr, func) { // eslint-disable-line camelcase
  //  discuss at: http://locutus.io/php/array_filter/
  // original by: Brett Zamir (http://brett-zamir.me)
  //    input by: max4ever
  // improved by: Brett Zamir (http://brett-zamir.me)
  //      note 1: Takes a function as an argument, not a function's name
  //   example 1: var odd = function (num) {return (num & 1);}
  //   example 1: array_filter({"a": 1, "b": 2, "c": 3, "d": 4, "e": 5}, odd)
  //   returns 1: {"a": 1, "c": 3, "e": 5}
  //   example 2: var even = function (num) {return (!(num & 1));}
  //   example 2: array_filter([6, 7, 8, 9, 10, 11, 12], even)
  //   returns 2: [ 6, , 8, , 10, , 12 ]
  //   example 3: array_filter({"a": 1, "b": false, "c": -1, "d": 0, "e": null, "f":'', "g":undefined})
  //   returns 3: {"a":1, "c":-1}

  var retObj = {}
  var k

  func = func || function (v) {
    return v
  }

  // @todo: Issue #73
  if (Object.prototype.toString.call(arr) === '[object Array]') {
    retObj = []
  }

  for (k in arr) {
    if (func(arr[k])) {
      retObj[k] = arr[k]
    }
  }

  return retObj
}
{% endcodeblock %}