PHP -- Boolean type determination

: This article mainly describes the determination of the Boolean type in PHP. For more information about PHP tutorials, see.

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

• Boolean value FALSE
• Integer value 0 (0)
• Floating point value: 0.0 (0)
• Empty string and string "0"
• Array that does not contain any elements
• Objects that do not include any member variables (applicable only to PHP 4.0)
• Special type NULL (including unassigned variables)
• SimpleXML object generated from null tag

All other values are considered to be TRUE (including any resources ).
Note:
-1 is considered TRUE like other non-zero values (both positive and negative values!

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