Application Blocked Application Blocked by Security Settings Your security settings have blocked an application from running with an out-of-date or expired version of Java.
Your security settings have blocked an untrusted application from running.
The other critical setting is the errors can be hidden (i.e.
Related Meta discussion: Relying on the default value of an uninitialized variable is problematic in the case of including one file into another which uses the same variable name.
It is also a major security risk with register_globals turned on.
E_NOTICE level error is issued in case of working with uninitialized variables, however not in the case of appending elements to the uninitialized array.
isset() language construct can be used to detect if a variable has been already initialized.