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Empty String Check◄╣

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► KB ► To/From Guides ► PHP

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Empty String Check (PHP and Corel Paradox Cross Reference Guide)

By Mike Prestwood

PHP versus Corel Paradox: A side by side comparison between PHP and Corel Paradox.

Operators

A language symbol used for assignment, comparison, computational, or as a logical.

Empty String Check

[Other Languages]

Languages Focus

An empty string is a zero length string, a string that is equal to null (""), or not assigned. In some languages, you can check if a string is empty by comparing it to an empty string (""). Some languages distinguish between nil and null ("") so checking if the length is 0 is easier.

[Not specified yet. Coming...]

Corel Paradox: isBlank() or not isAssigned()

In ObjectPAL, an empty variable can be unassigned (essentially null) or blank (equivalent to ""). You have to use both isBlank and isAssigned to check for an empty string.

Syntax Example:

var
 s String
endVar

;s = ""  ;Uncomment to test 2nd case.

if isBlank(s) or not isAssigned(s) Then
 msgInfo("", "empty string")
endIf

ObjectPAL Empty String Check (isBlank() or not isAssigned())