Core Function IsDeclared
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Revision as of 10:30, 28 November 2011
IsDeclared( <variable name> )
Contents |
Description
Check if a variable has been declared
Parameters
Expression
string representing name of the variable to be checked.
Return Value
Success: Returns 1 if variable has been assigned.
Failure: Returns 0 if variable doesnt exist yet.
Remarks
Example
If (!IsDeclared("a")) MsgBox('$a is NOT declared'); // $a has never been assigned $a=1; If (IsDeclared ("a")) MsgBox('$a IS declared'); //due to previous $a=1 assignment
