refactor: set site_url from method instead of static property (#13)

`site_url` is not needed for every operation, let's make it a method that can be called as needed instead of always setting it as static property on the `Database` class.

Reviewed-on: https://codeberg.org/vlw/wp/pulls/13

src/Database.php

@@ -9,7 +9,6 @@
 
 	class Database extends DatabaseFramework {
 		public static string $name = "";
-		public static string $site_url = "";
 
 		private static string $prefix = "wp";
 		private static string $hostname = "";
@@ -71,8 +70,6 @@
 				$database
 			);
 
-			$this->set_site_url();
-
 			parent::__construct();
 		}
 
@@ -90,11 +87,11 @@
 		}
 
 		/**
-		 * Fetch and set the WordPress siteurl from the options table
+		 * Fetch the WordPress siteurl from the options table
 		 *
 		 * @return void
 		 */
-		public function set_site_url() {
+		public function site_url() {
 			$query = new DatabaseFramework()
 				->from(static::$prefix . "_options")
 				->where(["option_name" => "siteurl"])
@@ -105,6 +102,6 @@
 				throw new Exception("Failed to fetch siteurl from options table");
 			}
 
-			self::$site_url = $query->fetch_assoc()["option_value"];
+			return $query->fetch_assoc()["option_value"];
 		}
 	}