下划线在$ this - > _ objectProperty中意味着什么？ [重复]

Question

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• What's the deal with a leading underscore in PHP class methods? 13 answers

I have encountered an instance where object properties look like this:

$this->property

and this:

$this->_property

What does the _ mean before ->? What difference does it make in terms of coding?

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Answer 1

Usually it is used for reminding the variable/function is private.