Compare query arguments supported by each WP REST API endpoint

query-params.php

<?php
/**
 * Prepare a table comparing query arguments supported by each endpoint
 *
 * wp eval-file query-params --skip-wordpress
 */
$endpoints = array(
	'posts'      => '/wp/v2/posts',
	'pages'      => '/wp/v2/pages',
	'media'      => '/wp/v2/media',
	'comments'   => '/wp/v2/comments',
	'categories' => '/wp/v2/categories',
	'tags'       => '/wp/v2/tags',
	'users'      => '/wp/v2/users',
	);

$endpoint_args = $params = $output = array();
$response = \WP_CLI\Utils\http_request( 'GET', 'http://wordpress-develop.dev/wp-json/' );
$args = json_decode( $response->body, true );

foreach( $endpoints as $type => $path ) {
	$endpoint_args[ $type ] = array_keys( $args['routes'][ $path ]['endpoints'][0]['args'] );
	$params = array_merge( $params, $endpoint_args[ $type ] );
}

$params = array_unique( $params );
sort( $params );

foreach( $params as $key ) {
	$param_data = array(
		'param' => $key,
		);
	foreach( array_keys( $endpoints ) as $endpoint ) {
		if ( in_array( $key, $endpoint_args[ $endpoint ] ) ) {
			$param_data[ $endpoint ] = '  x  ';
		} else {
			$param_data[ $endpoint ] = '';
		}
	}
	$output[] = $param_data;
}
\WP_CLI\Utils\format_items( 'table', $output, array_merge( array( 'param' ), array_keys( $endpoints ) ) );