PHP - Determination of Boolean type

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

• boolean FALSE itself
• integer value 0 (zero)
• floating point value 0.0 (zero)
• empty string, and string "0"
• An array that does not include any elements
• An object that does not include any member variables (only applicable to PHP 4.0)
• Special type NULL (including variables that have not been assigned a value)
• SimpleXML objects generated from empty tags

All other values ​​are considered TRUE (including any resources).
Note:
-1, like other non-zero values ​​(whether positive or negative), is considered TRUE!

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The above introduces the determination of Boolean type in PHP, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.