| Name | Summary | Category |
| var_defined | [Var_Defined] returns True if a variable has been defined in the current page or False otherwise. Can be used to check if a variable has been defined even if the current value of the variable is Null... | Variable |
| local_defined | [local_defined] returns True if a local variable has been defined in the current scope or False otherwise. Can be used to check if a local variable has been defined even if the current value of the... | Variable |
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