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For Wordpress 4.9: As I cant comment (new user). The final soultion (single WP install) I use for making is_user_logged_in() and current_user_can() work, is as follow below. We require('wp-load.php') first (to skip wp() in load-blog-header.php), and get ABSPATH constant then, manually includes exactly all the stuff needed.

Using define('SHORTINIT', true) + require('wp-load.php') + manually includes:

Pageload: 1.05 sek - included files: 43 files

Comparing: Using ONLY require('wp-load.php'):

Pageload: 1.35 sek - included files: 419 files

The time difference (0.3 sek) might differ from installs and PHP engines, but while validating many requests on one pageload -things adds up!

Remember to use relative call to WP installed dir. From a Wordpress custom plugin dir, inside one subdir level, normal install, a path should be like:

$wordpress = '../../../../wp-load.php';

Then:

define('SHORTINIT', true);
include_once $wordpress;

require_once ( ABSPATH . WPINC . '/class-wp-user.php' );
require_once ( ABSPATH . WPINC . '/class-wp-roles.php' );
require_once ( ABSPATH . WPINC . '/class-wp-role.php' );
require_once ( ABSPATH . WPINC . '/class-wp-session-tokens.php' );
require_once ( ABSPATH . WPINC . '/class-wp-user-meta-session-tokens.php' );
require_once ( ABSPATH . WPINC . '/formatting.php' );
require_once ( ABSPATH . WPINC . '/capabilities.php' );
//require_once ( ABSPATH . WPINC . '/query.php' ); // - might be useful
require_once ( ABSPATH . WPINC . '/user.php' );
require_once ( ABSPATH . WPINC . '/meta.php' );

wp_cookie_constants();

require_once ( ABSPATH . WPINC . '/vars.php' );
require_once ( ABSPATH . WPINC . '/kses.php' );
require_once ( ABSPATH . WPINC . '/rest-api.php' );
require_once ( ABSPATH . WPINC . '/pluggable.php' );

After this, user validation is accessable. For other task, running on one or two requests, tracking down other needed files ismight not be not worth 0.3 sek. Skip the SHORTINIT constant and manually clutter.

For Wordpress 4.9: As I cant comment (new user). The final soultion (single WP install) I use for making is_user_logged_in() and current_user_can() work, is as follow below. We require('wp-load.php') first (to skip wp() in load-blog-header.php), and get ABSPATH constant then, manually includes exactly all the stuff needed.

Using define('SHORTINIT', true) + require('wp-load.php') + manually includes:

Pageload: 1.05 sek - included files: 43 files

Comparing: Using ONLY require('wp-load.php'):

Pageload: 1.35 sek - included files: 419 files

The time difference (0.3 sek) might differ from installs and PHP engines, but while validating many requests on one pageload -things adds up!

Remember to use relative call to WP installed dir. From a Wordpress custom plugin dir, inside one subdir level, normal install, a path should be like:

$wordpress = '../../../../wp-load.php';

Then:

define('SHORTINIT', true);
include_once $wordpress;

require_once ( ABSPATH . WPINC . '/class-wp-user.php' );
require_once ( ABSPATH . WPINC . '/class-wp-roles.php' );
require_once ( ABSPATH . WPINC . '/class-wp-role.php' );
require_once ( ABSPATH . WPINC . '/class-wp-session-tokens.php' );
require_once ( ABSPATH . WPINC . '/class-wp-user-meta-session-tokens.php' );
require_once ( ABSPATH . WPINC . '/formatting.php' );
require_once ( ABSPATH . WPINC . '/capabilities.php' );
//require_once ( ABSPATH . WPINC . '/query.php' ); // - might be useful
require_once ( ABSPATH . WPINC . '/user.php' );
require_once ( ABSPATH . WPINC . '/meta.php' );

wp_cookie_constants();

require_once ( ABSPATH . WPINC . '/vars.php' );
require_once ( ABSPATH . WPINC . '/kses.php' );
require_once ( ABSPATH . WPINC . '/rest-api.php' );
require_once ( ABSPATH . WPINC . '/pluggable.php' );

After this, user validation is accessable. For other task, running on one or two requests, tracking down other needed files is not worth 0.3 sek. Skip the SHORTINIT constant and manually clutter.

For Wordpress 4.9: As I cant comment (new user). The final soultion (single WP install) I use for making is_user_logged_in() and current_user_can() work, is as follow below. We require('wp-load.php') first (to skip wp() in load-blog-header.php), and get ABSPATH constant then, manually includes exactly all the stuff needed.

Using define('SHORTINIT', true) + require('wp-load.php') + manually includes:

Pageload: 1.05 sek - included files: 43 files

Comparing: Using ONLY require('wp-load.php'):

Pageload: 1.35 sek - included files: 419 files

The time difference (0.3 sek) might differ from installs and PHP engines, but while validating many requests on one pageload -things adds up!

Remember to use relative call to WP installed dir. From a Wordpress custom plugin dir, inside one subdir level, normal install, a path should be like:

$wordpress = '../../../../wp-load.php';

Then:

define('SHORTINIT', true);
include_once $wordpress;

require_once ( ABSPATH . WPINC . '/class-wp-user.php' );
require_once ( ABSPATH . WPINC . '/class-wp-roles.php' );
require_once ( ABSPATH . WPINC . '/class-wp-role.php' );
require_once ( ABSPATH . WPINC . '/class-wp-session-tokens.php' );
require_once ( ABSPATH . WPINC . '/class-wp-user-meta-session-tokens.php' );
require_once ( ABSPATH . WPINC . '/formatting.php' );
require_once ( ABSPATH . WPINC . '/capabilities.php' );
//require_once ( ABSPATH . WPINC . '/query.php' ); // - might be useful
require_once ( ABSPATH . WPINC . '/user.php' );
require_once ( ABSPATH . WPINC . '/meta.php' );

wp_cookie_constants();

require_once ( ABSPATH . WPINC . '/vars.php' );
require_once ( ABSPATH . WPINC . '/kses.php' );
require_once ( ABSPATH . WPINC . '/rest-api.php' );
require_once ( ABSPATH . WPINC . '/pluggable.php' );

After this, user validation is accessable. For other task, running on one or two requests, tracking down other needed files might not be not worth 0.3 sek. Skip the SHORTINIT constant and manually clutter.

1
source | link

For Wordpress 4.9: As I cant comment (new user). The final soultion (single WP install) I use for making is_user_logged_in() and current_user_can() work, is as follow below. We require('wp-load.php') first (to skip wp() in load-blog-header.php), and get ABSPATH constant then, manually includes exactly all the stuff needed.

Using define('SHORTINIT', true) + require('wp-load.php') + manually includes:

Pageload: 1.05 sek - included files: 43 files

Comparing: Using ONLY require('wp-load.php'):

Pageload: 1.35 sek - included files: 419 files

The time difference (0.3 sek) might differ from installs and PHP engines, but while validating many requests on one pageload -things adds up!

Remember to use relative call to WP installed dir. From a Wordpress custom plugin dir, inside one subdir level, normal install, a path should be like:

$wordpress = '../../../../wp-load.php';

Then:

define('SHORTINIT', true);
include_once $wordpress;

require_once ( ABSPATH . WPINC . '/class-wp-user.php' );
require_once ( ABSPATH . WPINC . '/class-wp-roles.php' );
require_once ( ABSPATH . WPINC . '/class-wp-role.php' );
require_once ( ABSPATH . WPINC . '/class-wp-session-tokens.php' );
require_once ( ABSPATH . WPINC . '/class-wp-user-meta-session-tokens.php' );
require_once ( ABSPATH . WPINC . '/formatting.php' );
require_once ( ABSPATH . WPINC . '/capabilities.php' );
//require_once ( ABSPATH . WPINC . '/query.php' ); // - might be useful
require_once ( ABSPATH . WPINC . '/user.php' );
require_once ( ABSPATH . WPINC . '/meta.php' );

wp_cookie_constants();

require_once ( ABSPATH . WPINC . '/vars.php' );
require_once ( ABSPATH . WPINC . '/kses.php' );
require_once ( ABSPATH . WPINC . '/rest-api.php' );
require_once ( ABSPATH . WPINC . '/pluggable.php' );

After this, user validation is accessable. For other task, running on one or two requests, tracking down other needed files is not worth 0.3 sek. Skip the SHORTINIT constant and manually clutter.