PHP Boolean false value condition

When converted to Boolean, the following values are considered FALSE:

• The Boolean value FALSE itself

• Integer value 0 (0)

• Floating-point value 0.0 (0)

• Empty string

• String "0"

• An array that does not include any elements

• Objects that do not include any member variables (PHP 4.0 only applies)

• Special type NULL (including variables that have not been assigned)

• SimpleXML object generated from an empty tag

All other values are considered TRUE (including any resources).

Special note: ' False ' string false is true because it is a string with content, be aware of it!

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PHP Boolean false value condition