Php Oop

Concept
  1. Follow edited May 27 '20 at 1:10. 519 4 4 silver badges 18 18 bronze badges. Asked Dec 25 '09 at 20:42. Openfrog openfrog.
  2. PHP 5 is very very flexible in accessing member variables and member functions. These access methods maybe look unusual and unnecessary at first glance; but they are very useful sometimes; specially when you work with SimpleXML classes and objects.

PHP - What is Inheritance? Inheritance in OOP = When a class derives from another class. The child class will inherit all the public and protected properties and methods from the parent class. In addition, it can have its own properties and methods. No, PHP is not fully object oriented language. And neither is C or Java, because they all have primitive types (and PHP also has a huge collection of function like strreplace and is., which are clearly procedural in nature). Only pure object-oriented language, that i know of, are Ruby and Scala (and one could argue that latter is more. PHP OOP - Classes and Objects ❮ Previous Next ❯ A class is a template for objects, and an object is an instance of class.

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Php Oop Tutorial

Oop

Php Oop Examples

PHP 5 is very very flexible in accessing member variables and member functions. These access methods maybe look unusual and unnecessary at first glance; but they are very useful sometimes; specially when you work with SimpleXML classes and objects. I have posted a similar comment in SimpleXML function reference section, but this one is more comprehensive.
I use the following class as reference for all examples:
<?php
class Foo {
public
$aMemberVar = 'aMemberVar Member Variable';
public
$aFuncName = 'aMemberFunc';
function
aMemberFunc() {
print
'Inside `aMemberFunc()`';
}
}
$foo = new Foo;
?>

You can access member variables in an object using another variable as name:
<?php
$element
= 'aMemberVar';
print
$foo->$element; // prints 'aMemberVar Member Variable'
?>

or use functions:
<?php
function getVarName()
{ return
'aMemberVar'; }
print
$foo->{getVarName()}; // prints 'aMemberVar Member Variable'
?>

Important Note: You must surround function name with { and } or PHP would think you are calling a member function of object 'foo'.
you can use a constant or literal as well:
<?php
define
(MY_CONSTANT, 'aMemberVar');
print
$foo->{MY_CONSTANT}; // Prints 'aMemberVar Member Variable'
print $foo->{'aMemberVar'}; // Prints 'aMemberVar Member Variable'
?>

You can use members of other objects as well:
<?php
print $foo->{$otherObj->var};
print
$foo->{$otherObj->func()};
?>

You can use mathods above to access member functions as well:
<?php
print $foo->{'aMemberFunc'}(); // Prints 'Inside `aMemberFunc()`'
print $foo->{$foo->aFuncName}(); // Prints 'Inside `aMemberFunc()`'
?>