PHP Object Oriented Programming - Revision history

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Neil at 18:03, 13 May 2009

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Neil at 19:05, 11 May 2009

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Neil: /* How is an Object Created from a Class? */

2009-03-19T14:35:32Z

‎How is an Object Created from a Class?

Neil at 20:16, 7 June 2007

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	The ''method_exists()'' function, when passed an object pointer and method name as arguments, will return a true or false value indicating the existence of the method.		The ''method_exists()'' function, when passed an object pointer and method name as arguments, will return a true or false value indicating the existence of the method.

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 == How is an Object Created from a Class? ==
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 The process of creating an object from the class 'blueprint' is called instantiation. Essentially, you instantiate an instance of the class and give that instance a name by which you will refer to it when accessing members and calling methods. You can create as many object instances of a class as you desire. Objects are instantiated using the ''new'' keyword. For example, to create an instance of a class called ''bankAccount'' we would write:

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 Class members are essentially variables and methods embedded into the class. Members can be ''public'' or ''private'' and ''static'' or ''variable''.
-''public'' members can be accessed from outside the object. ''private'' members can only be accessed by methods contained in the class. This the key to what is called ''data encapsulation''. Object-oriented programming convention dictates that data should be encapsulated in the class and accessed and set only through the methods of the class (typically called ''getters'' and ''setters'').
+''public'' members can be accessed from outside the object. ''private'' members can only be accessed by methods contained in the class. This is the key to what is called ''data encapsulation''. Object-oriented programming convention dictates that data should be encapsulated in the class and accessed and set only through the methods of the class (typically called ''getters'' and ''setters'').
 Members declared as ''static'' are immutable, in that once defined they cannot be changed (much like constants). Members and functions are prefixed with ''public'', ''private'' and ''static'' when declared in the class. The default is ''public'' ''non-static''.
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 == Subclassing in PHP ==
-Once a class has been defined it is possible to create a new class derived from it that extends the functionality of the original class. The parent class is called the ''superclass'' and the child the ''subclass''. The whole process is referred to as 'subclassing''.
+Once a class has been defined it is possible to create a new class derived from it that extends the functionality of the original class. The parent class is called the ''superclass'' and the child the ''subclass''. The whole process is referred to as ''subclassing''.
-A subclass of a class can be defined using the ''extends'' keyword when declaring the subclass. For example we might choose to create a subclass of of our ''bankAccount'' class called ''savingsAccount'' which defines an interest bearing type of account:
+A subclass of a class can be defined using the ''extends'' keyword when declaring the subclass. For example we might choose to create a subclass of our ''bankAccount'' class called ''savingsAccount'' which defines an interest bearing type of account:
 <pre>
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 All objects have built-in method called ''__sleep'' that is called before serialization. If you need your object to perform any housekeeping before being serialized you will need to override this method.
-An object is serialized using the ''serialize()'' function and unserialized, not surprizsingly, using the ''unserialize()'' function. As an example we can serialize our bankAccount object:
+An object is serialized using the ''serialize()'' function and unserialized, not surprisingly, using the ''unserialize()'' function. As an example we can serialize our bankAccount object:
 <pre>
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 </tt>
-Once we have the serialized data in our $serialized we can do anything we want with it, such as write it to a file or send it through a network socket to another process where it can be unserialized and used.
+Once we have the serialized data in our $serialized object we can do anything we want with it, such as write it to a file or send it through a network socket to another process where it can be unserialized and used.
 == Getting Information about a PHP Object ==
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 The ''method_exists()'' function, when passed an object pointer and method name as arguments, will return a true or false value indicating the existence of the method.

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 == How is an Object Created from a Class? ==
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 The process of creating an object from the class 'blueprint' is called instantiation. Essentially, you instantiate an instance of the class and give that instance a name by which you will refer to it when accessing members and calling methods. You can create as many object instances of a class as you desire. Objects are instantiated using the ''new'' keyword. For example, to create an instance of a class called ''bankAccount'' we would write:

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	PHP provides extensive support for developing object-oriented web applications. The area of object oriented programming is, however, large. Entire books can, and indeed have, been dedicated to the subject. As such, a detailed overview of object oriented software development is beyond the scope of [[PHP Essentials]]. Instead we will introduce the basic concepts involved in object oriented programming and then move on to explaining the concept as it relates to PHP development.		PHP provides extensive support for developing object-oriented web applications. The area of object oriented programming is, however, large. Entire books can, and indeed have, been dedicated to the subject. As such, a detailed overview of object oriented software development is beyond the scope of [[PHP Essentials]]. Instead we will introduce the basic concepts involved in object oriented programming and then move on to explaining the concept as it relates to PHP development.

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-PHP provides extensive support for developing object-oriented web applications. The area of object oriented programming is, however, large. Entire books can, and indeed have, been dedicated to the subject. As such, a detailed overview of object oriented software development is beyond the scope of this PHP book. Instead we will introduce the basic concepts involved in object oriented programming and then move on to explaining the concept as it relates to PHP development.
+PHP provides extensive support for developing object-oriented web applications. The area of object oriented programming is, however, large. Entire books can, and indeed have, been dedicated to the subject. As such, a detailed overview of object oriented software development is beyond the scope of [[PHP Essentials]]. Instead we will introduce the basic concepts involved in object oriented programming and then move on to explaining the concept as it relates to PHP development.
 == What is an Object? ==
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 == How is an Object Created from a Class? ==
-The process of creating an object from the class 'blueprint' is called instantiation. Essentially, you instantiate an instance of the class and give that instance a name by which you will refer to it when acessing members and calling methods. You can create as many object instances of a class as you desire. Objects are instantiated using the ''new'' keyword. For example, to create an instance of a class called ''bankAccount'' we would write:
+The process of creating an object from the class 'blueprint' is called instantiation. Essentially, you instantiate an instance of the class and give that instance a name by which you will refer to it when accessing members and calling methods. You can create as many object instances of a class as you desire. Objects are instantiated using the ''new'' keyword. For example, to create an instance of a class called ''bankAccount'' we would write:
 <tt>$accountObject = new bankAccount();</tt><br>
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 == PHP Object Serialization ==
-One of the interesting feature of object oriented programming is the ability to take a snapshot of the current state of an object and then save that object to a file, or even transmit it over a network to another process where it will be re-activated. This concept is known in the object oriented world as ''object serialization''.
+One of the interesting features of object oriented programming is the ability to take a snapshot of the current state of an object and then save that object to a file, or even transmit it over a network to another process where it will be re-activated. This concept is known in the object oriented world as ''object serialization''.
 All objects have built-in method called ''__sleep'' that is called before serialization. If you need your object to perform any housekeeping before being serialized you will need to override this method.