PHP's echo in TypeScript

How to use

Install via yarn add locutus and import: import { echo } from 'locutus/php/strings/echo'.

Or with CommonJS: const { echo } = require('locutus/php/strings/echo')

Use a bundler that supports tree-shaking so you only ship the functions you actually use. Vite, webpack, Rollup, and Parcel all handle this. For server-side use this is less of a concern.

Examples

These examples are extracted from test cases that automatically verify our functions against their native counterparts.

#	code	expected result
1	echo('Hello world')	undefined

Notes

• In 1.3.2 and earlier, this function wrote to the body of the document when it was called in webbrowsers, in addition to supporting XUL. This involved >100 lines of boilerplate to do this in a safe way. Since I can’t imageine a complelling use-case for this, and XUL is deprecated I have removed this behavior in favor of just calling console.log

• You’ll see functions depends on echo instead of console.log as we’ll want to have 1 contact point to interface with the outside world, so that it’s easy to support other ways of printing output.

Here's what our current TypeScript equivalent to PHP's echo looks like.

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

import type { PhpRuntimeValue } from '../_helpers/_phpTypes.ts'

type EchoValue = PhpRuntimeValue

export function echo(...args: EchoValue[]): void {
  //      discuss at: https://locutus.io/php/echo/
  // parity verified: PHP 8.3
  //     original by: Philip Peterson
  //     improved by: echo is bad
  //     improved by: Nate
  //     improved by: Brett Zamir (https://brett-zamir.me)
  //     improved by: Brett Zamir (https://brett-zamir.me)
  //     improved by: Brett Zamir (https://brett-zamir.me)
  //      revised by: Der Simon (https://innerdom.sourceforge.net/)
  //     bugfixed by: Eugene Bulkin (https://doubleaw.com/)
  //     bugfixed by: Brett Zamir (https://brett-zamir.me)
  //     bugfixed by: Brett Zamir (https://brett-zamir.me)
  //     bugfixed by: EdorFaus
  //          note 1: In 1.3.2 and earlier, this function wrote to the body of the document when it
  //          note 1: was called in webbrowsers, in addition to supporting XUL.
  //          note 1: This involved >100 lines of boilerplate to do this in a safe way.
  //          note 1: Since I can't imageine a complelling use-case for this, and XUL is deprecated
  //          note 1: I have removed this behavior in favor of just calling `console.log`
  //          note 2: You'll see functions depends on `echo` instead of `console.log` as we'll want
  //          note 2: to have 1 contact point to interface with the outside world, so that it's easy
  //          note 2: to support other ways of printing output.
  //      revised by: Kevin van Zonneveld (https://kvz.io)
  //        input by: JB
  //       example 1: echo('Hello world')
  //       returns 1: undefined

  return console.log(args.join(' '))
}

export function echo(...args) {
  //      discuss at: https://locutus.io/php/echo/
  // parity verified: PHP 8.3
  //     original by: Philip Peterson
  //     improved by: echo is bad
  //     improved by: Nate
  //     improved by: Brett Zamir (https://brett-zamir.me)
  //     improved by: Brett Zamir (https://brett-zamir.me)
  //     improved by: Brett Zamir (https://brett-zamir.me)
  //      revised by: Der Simon (https://innerdom.sourceforge.net/)
  //     bugfixed by: Eugene Bulkin (https://doubleaw.com/)
  //     bugfixed by: Brett Zamir (https://brett-zamir.me)
  //     bugfixed by: Brett Zamir (https://brett-zamir.me)
  //     bugfixed by: EdorFaus
  //          note 1: In 1.3.2 and earlier, this function wrote to the body of the document when it
  //          note 1: was called in webbrowsers, in addition to supporting XUL.
  //          note 1: This involved >100 lines of boilerplate to do this in a safe way.
  //          note 1: Since I can't imageine a complelling use-case for this, and XUL is deprecated
  //          note 1: I have removed this behavior in favor of just calling `console.log`
  //          note 2: You'll see functions depends on `echo` instead of `console.log` as we'll want
  //          note 2: to have 1 contact point to interface with the outside world, so that it's easy
  //          note 2: to support other ways of printing output.
  //      revised by: Kevin van Zonneveld (https://kvz.io)
  //        input by: JB
  //       example 1: echo('Hello world')
  //       returns 1: undefined

  return console.log(args.join(' '))
}

Improve this function

Locutus is a community effort following The McDonald's Theory: we ship first iterations, hoping others will improve them. If you see something that could be better, we'd love your contribution.

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