PHP function to insert a custom column in the WordPress User Table

<?php 
/*--------------------------------------------------------------
INSERT USER ID COLUMN
--------------------------------------------------------------*/ 
// Adding the column
add_filter( 'manage_users_columns', 'btwp_user_id_column' );
function btwp_user_id_column( $columns ) {
$columns['user_id'] = 'ID';
return $columns;
}
// Column content
add_action( 'manage_users_custom_column', 'btwp_user_id_column_content', 10, 3 );
function btwp_user_id_column_content( $value, $column_name, $user_id ) {
if ( 'user_id' == $column_name )
return $user_id;
return $value;
}
// Column style
add_action( 'admin_head-users.php', 'btwp_user_id_column_style' );
function btwp_user_id_column_style() {
echo '<style>.column-user_id{width: 5%}</style>';
}

MIT Licensed Code

Tags: wp, wordpress, dashboard, php, add_action, admin_bar_menu, custom_toolbar_link