[WordPress] Singletons in WordPress, Revisited

00-date-formatter-refactored.php

<?php

class Date_Formatter {
  
	public static function get() {

		$default_format = 'm/d/Y';

		$format = get_option( 'yhd_directory_importer', false );
		if ( false === $format ) {
			return $default_format;
		}

		$format = $format['date'];
		$format =
			( isset( $format ) && isset( $format['format'] ) ) ?
			$format['format'] :
			$default_format;

		return $format;
	}
}

00-date-formatter-singleton.php

<?php

class Date_Formatter {
  
	private static $instance;
  
	private function __construct() {
	}
  
	private static function get_instance() {
    
		if ( null === self::$instance ) {
			self::$instance = new self;
		}
    
		return self::$instance;
	}
  
	public static function get() {
    
		self::get_instance();
    
		$default_format = 'm/d/Y';
		$format = get_option( 'yhd_directory_importer', false );
		if ( false === $format ) {
			return $default_format;
		}
    
		$format = $format['date'];
		$format =
			( isset( $format ) && isset( $format['format'] ) ) ?
			$format['format'] :
			$default_format;
    
		return $format;
	}
}