NULL，0，False和''之间的区别？ [重复]

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• Null vs. False vs. 0 in PHP 18 answers

What is the exact difference between null, 0, false, and an empty string in PHP? Is null similar to None in python?

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Answer 1

Well, after massive comments and then poof deletion of them... may as well try to help you out.

null is the absence of value.

0 can be a numeric value, or a representation of a boolean FALSE, or a string. PHP doesn't really have variable typing, so depending on what you are checking for using ==0 or ===0 or ==false or ===false may be appropriate.

You may want to read over this - https://www.virendrachandak.com/techtalk/php-isset-vs-empty-vs-is_null/ as well as the PHP manual for isset() and empty()