Ticket #19898: 19898.6.diff

src/wp-includes/load.php

@@ -999 +999 @@
         return false;
 }
 
+/**
+ * Determines whether the current request is for the login screen.
+ * 
+ * @since 5.3.0
+ * 
+ * @see wp_login_url()
+ * @global string $_SERVER['SCRIPT_NAME'] The absolute pathname of the currently executing script.
+ *
+ * @return boolean
+ */
+function is_login_screen() {
+        return false !== stripos( wp_login_url(), $_SERVER['SCRIPT_NAME'] );
+}
+
 /**
  * Whether the current request is for a site's admininstrative interface.
  *