PHP Boolean false value condition

Source: Internet
Author: User
Tags type null

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!


This article is from the "Yu translation" blog, please be sure to keep this source http://yuyiphp.blog.51cto.com/4736496/1764131

PHP Boolean false value condition

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