Object-oriented example Analysis in php

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A preliminary study of php object-oriented

1. Class: a class is a collection of properties and methods is an abstract concept such as "people" and "cars" in life.

two。 Object: the object is specific things, such as a person called "Xiaoqiang" and a car called "Audi A7".

3. The relationship between a class and an object: a class is an abstract collection of something. The object is a concrete part of the class.

Example 1: create a Person class

Step 1: declare a Person class

The member attribute of the class Person {/ / Person class declares that the property of the class should be declared using the var keyword var $name; var $age; var $sex; / / Person class member method function say () {echo "this person speaks again";} function run () {echo "this person is walking";}}

Step 2: instantiate the object

/ / the new keyword creates an instance $person1=new Person (); / / creates an instance of the person class $person2=new Person ()

Step 3: object member assignment

/ / object property assignment (using->) / / object $person1 object property initialization assignment; $person1- > name= "Zhang San"; $person1- > age=25;$person1- > sex= "male"; / / object $person2 object property initialization assignment; $person2- > name= "Li Si"; $person2- > age=23;$person2- > sex= "female"

Step 4: access the object

/ / the following is the property echo "person1 object" in the access object $person1 object: ". $person1- > name,"

"; / output the value of $name in the $person1 object; the age of the echo" person1 object is ". $person1- > age,"

"; / output the value of $age in the $person1 object; the gender of the echo" person1 object is: ". $person1- > sex,"

"; / / output the value of $sex in the $person1 object; / / here is the method echo that accesses the object $person1 object"

"; $person1- > say (); echo"

"; $person1- > run (); echo"

"; / / the following is the property echo in the access object $person2 object"

"; echo" person2 object name is: ". $person2- > name,"

"; / output the value of $name in the $person2 object; the age of the echo" person2 object is ". $person2- > age,"

"; / output the value of $age in the $person2 object; the gender of the echo" person2 object is: ". $person2- > sex,"

"; / / output the value of $sex in the $person2 object

Example 2: create a phone class (complete)

/ declare a phone Phone class class Phone {var $Manuefatuures; var $color; var $Battry_capacity; var $Screen_size; function call () {echo "on the phone";} function message () {echo "sending text message";} function Play_music () {echo "music playing";} function photo () {echo "taking a picture";}} echo "

The object of a mobile phone

"; / / create an instance of the Phone object $phone1=new Phone (); $phone1- > Manuefatuures=" huawei p6 "; $phone1- > color=" black "; $phone1- > Battry_capacity=3000;$phone1- > Screen_size=" 360 instances 480 "; echo $phone1- > Manuefatuures."

"echo $phone1- > color."

"echo $phone1- > Battry_capacity."

"echo $phone1- > Screen_size."

"

Php object oriented (2) $this

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