Passing PHP Function Arguments from CLI vs URL

Question

For this code:

<?php
define('WP_USE_THEMES', false);
require('./wp-blog-header.php');

if (PHP_SAPI === 'cli') {
  $post_id          =$argv[1]; 
  $post_title       =$argv[2];
}
else {
  $post_id          =$_GET['post_id']; 
  $post_title       =$_GET['post_title']; 
}
if (empty($_GET)){
  $post_id = 0;
  $post_title='My Post Title';
}

echo "Done";
return;

This call throws no errors, warning or notices, and shows the message Done.

https://www.example.com/function.php?post_id=0&post_title=My Post Title

This call

php -f ~/public_html/function.php -- 0 'My Post Title'

throws the following warning and notice, and do not show the message Done:

Notice: Undefined index: SERVER_PROTOCOL in /home/examplecom/public_html/wp-includes/load.php on line 16
Warning: Cannot modify header information - headers already sent by (output started at /home/examplecom/public_html/wp-includes/load.php:16) in /home/examplecom/public_html/wp-includes/pluggable.php on line 1223

How should I fix that?

Answer 1

You can do this:

function foo_command( $args ) {
    WP_CLI::success( $args[0] );
}
WP_CLI::add_command( 'foo', 'foo_command' );

And put it in a plugin, then run:

wp foo "hello world"

And it will print out hello world.

Just because the built in subcommands don't do what you need them to do, doesn't mean you can't add your own. WP CLI will take care of bootstrapping WordPress and loading things properly ( and it avoids the security issues of standalone endpoint PHP files such as the one in your question )

However, I suspect the solution to your actual problem is this:

wp post list --name="hello-world" --fields="id"

And for the REST API:

https://example.com/wp-json/wp/v2/posts/slug?="hello-world"