Core Function IsDeclared
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1 = Local scope only | 1 = Local scope only | ||
2 = Global scope only | 2 = Global scope only | ||
| + | 3 = Max depth local scope only (Such as a classes My) | ||
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=== Remarks === | === Remarks === | ||
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| + | It is worth noting that even if the variable is $a = null; it will be considered DEFINED since it does exist | ||
=== Example === | === Example === | ||
Latest revision as of 20:06, 14 June 2015
IsDeclared( <variable name>, <flag> )
Contents |
Description
Check if a variable has been declared
Parameters
variable name
String representing name of the variable to be checked.
flag
Optional; Flag to decide the scope to be checked.
0 = ANY scope (Should be Local first then Global) (Default) 1 = Local scope only 2 = Global scope only 3 = Max depth local scope only (Such as a classes My)
Return Value
Success: Returns true if variable has been assigned.
Failure: Returns false if variable doesn't exist yet.
Remarks
It is worth noting that even if the variable is $a = null; it will be considered DEFINED since it does exist
Example
If (!IsDeclared("a")) MsgBox('$a is NOT declared'); // $a has never been assigned $a=1; If (IsDeclared ("a")) MsgBox('$a IS declared'); //due to previous $a=1 assignment
