[WordPress] Read All Files of a Certain Type / Delete All Files in a Directory

00-read-files.php

<?php

public function read_files() {

	$uploads_directory = trailingslashit(
		plugin_dir_path( dirname( __FILE__ ) )
	) . 'uploads/';

	$files = array();
	foreach ( glob( $uploads_directory . 'file_*.txt' ) as $file ) {
		array_push( $files, $file );
	}

	return $files;
}

01-delete-all-files.php

<?php

public function delete_all_files() {

	$directory = trailingslashit( $uploads_directory );
	$files     = glob( $directory . '{,.}*', GLOB_BRACE );

	foreach ( $files as $file ) {
		if ( is_file( $file ) ) {
			unlink( $file );
		}
	}
}