this is a development document on how to implement WordPress backend command line triggers, so as to do scheduled tasks.
We need a simple plugin to trigger it from inside WordPress, if we don’t want to develop a plugin, we can patch the following code into any plugin we like.
// 1. Command is a function
function foo_command( $args ) {
WP_CLI::success( $args[0] );
}
WP_CLI::add_command( 'foo', 'foo_command' );
// 2. Command is a closure
$foo_command = function( $args ) {
WP_CLI::success( $args[0] );
}
WP_CLI::add_command( 'foo', $foo_command );
// 3. Command is a method on a class
class Foo_Command {
public function __invoke( $args ) {
WP_CLI::success( $args[0] );
}
}
WP_CLI::add_command( 'foo', 'Foo_Command' );
// 4. Command is a method on a class with constructor arguments
class Foo_Command {
protected $bar;
public function __construct( $bar ) {
$this->bar = $bar;
}
public function __invoke( $args ) {
WP_CLI::success( $this->bar . ':' . $args[0] );
}
}
$instance = new Foo_Command( 'Some text' );
WP_CLI::add_command( 'foo', $instance );
With that entry point, we can trigger any functions inside WordPress as if people are visiting the WordPress website.