a576ddfd_PHP__Runkit_Sandbox___Manual_x_Settings___Status_Indicators_Purpose
[Setting] parent_scope [Type] String [Purpose] 
When parent_scope is set to a string value, it refers to a named array variable in the global scope. If the named variable does not exist at the time of access it will be created as an empty array. If the variable exists but it not an array, a dummy array will be created containing a reference to the named global variable.
PHP: Runkit_Sandbox - Manual
Purpose