Add sortable custom field columns to WordPress backend

add-sortable-custom-field-columns-to-wordpress-backend

// Register the column
function METAKEYHERE_column_register( $columns ) {
	$columns['METAKEYHERE'] = __( 'COLUMNLABEL', 'POSTTYPE' );
 
	return $columns;
}
add_filter( 'manage_edit-POSTTYPE_columns', 'METAKEYHERE_column_register' );

// Display the column content
function METAKEYHERE_column_display( $column_name, $post_id ) {
	if ( 'METAKEYHERE' != $column_name )
		return;
 
	$METAKEYHERE = get_post_meta($post_id, 'METAKEYHERE', true);
	if ( !$METAKEYHERE ){
		$METAKEYHERE = 'No phone';
	}
	else {
		$METAKEYHERE;
	}
 
	echo $METAKEYHERE;
}
add_action( 'manage_posts_custom_column', 'METAKEYHERE_column_display', 10, 2 );
add_action( 'manage_pages_custom_column', 'METAKEYHERE_column_display', 10, 2 );

// Register the column as sortable
function METAKEYHERE_column_register_sortable( $columns ) {
	$columns['METAKEYHERE'] = 'METAKEYHERE';
	return $columns;
}
add_filter( 'manage_edit-POSTTYPE_sortable_columns', 'METAKEYHERE_column_register_sortable' );

function METAKEYHERE_column_orderby( $vars ) {
	if ( isset( $vars['orderby'] ) && 'METAKEYHERE' == $vars['orderby'] ) {
		$vars = array_merge( $vars, array(
			'meta_key' => 'METAKEYHERE',
			'orderby' => 'meta_value_num'
		) );
	}
	return $vars;
}
add_filter( 'request', 'METAKEYHERE_column_orderby' );