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This article mainly shows you "how to use the access modifier in php". The content is simple and clear. I hope it can help you solve your doubts. Let me lead you to study and learn this article "how to use the access modifier in php".

There are three access modifiers in PHP, which are:

Public (public, default)

Protected (protected)

Private (private)

Public (public, default) in PHP5, if the class does not specify an access modifier for a member, the default is public access.

Protected (protected) is declared as a member of protected, allowing access only to subclasses of this class.

Private (private) is defined as a member of private and is visible to all members within the class with no access restrictions. Access is not allowed outside the class.

Graphic illustration

Demo

The copy code is as follows:

Class Woman {

Public $name = "gaojin"

Protected $age = "22"

Private $height = "170"

Function info () {

Echo $this- > name

}

Private function say () {

Echo "this is a proprietary method"

}

}

/ / $w = new Woman ()

/ / echo $w-> info ()

/ / echo $w-> the name;// public property can be accessed

/ / echo $w-> age;// protected attribute, fatal error reported

/ / echo $w-> height;// protected attribute, fatal error reported

/ / Private method, access error

/ / $w-> say (); / / Private method, access error

Class Girl extends Woman {

/ / you can redefine the public and protected methods of the parent class, but not the private

/ / protected $name = "jingao"; / / can be redefined from

Function info () {

Echo $this- > name

Echo $this- > age

Echo $this- > height

}

Function say () {

/ / parent::say (); / / Private methods cannot be inherited if the say method of the parent class is protected, no error will be reported here

Echo, "I'm a girl."

}

}

G = new Girl ()

G-> say (); / / normal output

/ / echo $g-> height;// private attribute cannot be accessed and no result is output

/ / $g-> info (); / / this is the output gaojin22 $height property that is private and not inherited

/ / $g-> height = "12"; / / here the height property is redefined and assigned

/ / $g-> info (); / / so gaojin2212 will be output here

The above is all the content of the article "how to use access modifiers in php". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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