Getting Started with PHP object-oriented programming

1. Development and interpretation:

Compilation: Machine oriented

C language: Process oriented

Java : Object-oriented

PHP : Supports object-oriented

In fact, the class is also a data type

a . classes are abstract and represent a class of things

B. object is specific and is a concrete instance of the class

c. A class is a template for an object that is an individual instance of a class

2. Simple Introductory case :

<?phpclass Cat{public$name;public$age;public$color;} $cat 1=newcat ();//Instantiate a class/create an object/instantiation object the same meaning $cat1->name= "small white"; $cat 1->age=10; $cat 1->color= "Red"; $ findcat= "Small white", if ($cat 1->name== $FindCat) {ECHO $FindCat. " Exist ";} ?>

3. Usage

a . description of the member property:

A member property is extracted from something, which can be a basic data type (integer, Decimal, Character, Boolean), or a composite data type (array, object)

Class class name {

member Properties ;

}

b . Creating Objects :

$ Object Name =new class name ();

Or

$ Object Name =new class name ;

C . Accessing Object Properties

$ Object Name - Property name ;

D . class Naming Conventions

If a file is specifically used to define a class, there is no class operation, its naming specification:

class name . class.php

Class class name

{

}

4. Detailed explanation from memory

Memory diagram

Heap Area : objects, usually with smaller

Stack Area : Basic data class, generally larger

Case 1 :

<?phpclass Cat{public$name;public$age;public$color;} $c =90, $cat 1=newcat (), $cat 1->name= "small white", $cat 1->age=10; $cat 1->color= "Red"; $cat 2= $cat 1?>

The memory graph is as follows:

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Case 2 :

<?php$a=9; $b = $a; $b = $b +8; echo$a. " ". $b;? >

The memory graph is as follows:

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Case 3 :

<?php$a=9; $b =& $a; $b = $b +8; echo$a. " ". $b;? >

The memory graph is as follows:

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Case 4:

<?phpclassperson{public $name; Public$age;} $p 1=newperson (); $p 1->name= "Xiao Ming"; $p 1->age=10; Functiontest1 ($p) {$p->name= "Floret";} Test1 ($p 1); Echo$p1->name;? >

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a. when the function receives the object, it receives the value address ?

B. if it is a basic data type? By default , A value is passed If you want to pass in an address :

functiontest (&$ variable name )

{

}

in the PHP , if you pass an array to a function, it is passed by default (a new array is copied), if you want to pass in an address :

FunctionTest (&$array)

{

}

Problem?

<?php$arr=array ($a 1, $a 2), $a 1=array, $a 2=array (4,5,6,7), foreach ($arr as $k + = $v) {echo "$k = $v";} Var_dump ($arr);? >

..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ... .. ....... ..... difference

<?php$a1=array, $a 2=array (4,5,6,7), $arr =array ($a 1, $a 2), foreach ($arr as $k + = $v) {echo "$k = $v";} Var_dump ($arr);? >

Error

This article is from "Uncle Wei Xiaobao" blog, please be sure to keep this source http://darmi.blog.51cto.com/11607923/1774885

Getting Started with PHP object-oriented programming