/website/source/php/math/log.html

---
warning: 'This file is auto generated by `npm run web:inject`, do not edit by hand'
examples:
  - 'log(8723321.4, 7)'
returns:
  - '8.212871815082147'
dependencies: []
authors:
  original by:
    - 'Onno Marsman (https://twitter.com/onnomarsman)'
  improved by:
    - 'Brett Zamir (https://brett-zamir.me)'
notes: []
type: function
layout: function
title: PHP's log in JavaScript
description: >-
  Here’s what our current JavaScript equivalent to <a
  href="https://php.net/manual/en/function.log.php">PHP's log</a> looks like.
function: log
category: math
language: php
permalink: php/math/log/
alias:
  - /functions/php/log/
  - /functions/math/log/
  - /php/log/
  - /functions/log/
---
{% codeblock lang:javascript %}module.exports = function log (arg, base) {
  //  discuss at: https://locutus.io/php/log/
  // original by: Onno Marsman (https://twitter.com/onnomarsman)
  // improved by: Brett Zamir (https://brett-zamir.me)
  //   example 1: log(8723321.4, 7)
  //   returns 1: 8.212871815082147

  return (typeof base === 'undefined')
    ? Math.log(arg)
    : Math.log(arg) / Math.log(base)
}
{% endcodeblock %}