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Object Oriented. Programming in. PHP. CMPS 183 Hypermedia and the Web ... PHP reserves the variable $this to. refer to the object whose context the ...

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OO Programming in PHP.keyPage 1Object Oriented Programming in PHPCMPS 183 Hypermedia and the WebMay 1 2006Mark Slatermslater@soe.ucsc.eduPage 2Object Oriented Basics OO programs consist of hierarchies andwebs of Classes. Classes contain data and functions that act on that data. Classes can be extended through inheritance (hierarchy). Classes can contain other classes (web).Page 3A Sample PHP Class<?phpclass ImgTagGenerator{function makeImgTag( $location ){if( isset( $location ) && ( strlen( location ) > 0 ) ){echo "<IMG src="" . $location . ""> ";}else{echo "&nbsp;<!Image location not specified!> ";}}}?>Page 4$this PHP reserves the variable $this to refer to the object whose context the function was invoked from. Usually $this refers to the object the function belongs to.Page 5$this<?phpclass A{public $num;function __construct( $num ){$this>num = $num;}function getNum(){return( $this>num );}}class B{public $num;function __construct( $num ){$this>num = $num;}function getNum(){return( $this>num );}function getANum(){return( A::getNum() );}}$a = new A( 5 );$b = new B( "six" );echo "A num = " . $a>getNum() . "<br> ";echo "B num = " . $b>getNum() . "<br> ";echo "A num from B = " . $b>getANum() . "<br> ";?>Page 6$this The context in the getANum()function is Bs. When AsgetNum() functionis called statically the context does notchange.class B{...function getANum(){return( A::getNum() );}}Page 7Creating and Assigning Objects Just like Java C++ and other OO languages PHP has a new operator thatcreates instances of classes. Assigning a variable containing an object to another variable makes a copy. Assigning a reference to another variable does not.Page 8Creating and Assigning Objects<?phpclass A{public $num;function __construct( $num ){$this>num = $num;}function getNum(){return( ...

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