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abukta
super admin
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Join Date: 29 Mar 2005 21:03
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An object is a compound data type that can contain any number of variables and functions. PHP's support for objects is very basic in Version 3. PHP Version 4 will improve the object-oriented capabilities of PHP. In PHP 3.0 the object-oriented support is designed to make it easy to encapsulate data structures and functions in order to package them into reusable classes. Here's a simple example:
| Code: | class test {
var $str = "Hello World";
function init($str) {
$this->str = $str;
}
}
$class = new test;
print $class->str;
$class->init("Hello");
print $class->str;
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This code creates a test object using the new operator. Then it sets a variable called str within the object. In object-speak, a variable in an object is known as a property of that object. The test object also defines a function, known as a method, called init( ). This method uses the special-purpose $this variable to change the value of the str property within that object.
If you are familiar with object-oriented programming, you should recognize that PHP's implementation is minimal. PHP3 does not support multiple inheritance, data protection (or encapsulation), and destructors. PHP does have inheritance and constructors, though.
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