/website/source/php/strings/chr.html

---
warning: 'This file is auto generated by `npm run web:inject`, do not edit by hand'
examples:
  - |-
    chr(75) === 'K'
    chr(65536) === '\uD800\uDC00'
returns:
  - |-
    true
    true
dependencies: []
authors:
  original by:
    - 'Kevin van Zonneveld (https://kvz.io)'
  improved by:
    - 'Brett Zamir (https://brett-zamir.me)'
notes: []
type: function
layout: function
title: PHP's chr in JavaScript
description: >-
  Here’s what our current JavaScript equivalent to <a
  href="https://php.net/manual/en/function.chr.php">PHP's chr</a> looks like.
function: chr
category: strings
language: php
permalink: php/strings/chr/
alias:
  - /functions/php/chr/
  - /functions/strings/chr/
  - /php/chr/
  - /functions/chr/
---
{% codeblock lang:javascript %}module.exports = function chr (codePt) {
  //  discuss at: https://locutus.io/php/chr/
  // original by: Kevin van Zonneveld (https://kvz.io)
  // improved by: Brett Zamir (https://brett-zamir.me)
  //   example 1: chr(75) === 'K'
  //   example 1: chr(65536) === '\uD800\uDC00'
  //   returns 1: true
  //   returns 1: true

  if (codePt > 0xFFFF) { // Create a four-byte string (length 2) since this code point is high
    //   enough for the UTF-16 encoding (JavaScript internal use), to
    //   require representation with two surrogates (reserved non-characters
    //   used for building other characters; the first is "high" and the next "low")
    codePt -= 0x10000
    return String.fromCharCode(0xD800 + (codePt >> 10), 0xDC00 + (codePt & 0x3FF))
  }
  return String.fromCharCode(codePt)
}
{% endcodeblock %}