"PHP and MySQL Program design" chapter sixth

Setting properties with the _ _set () method

boolean __set ([string property_name], [mixed value_to_assign])

I wrote an easy-to-understand

<?PHPclassemployee{var $name; function__set ($propName,$propValue)    {        Echo' $name = '.$this->name. ' <br/> '; Echo' $propName = '.$propName. ' <br/> '; Echo' $propValue = '.$propValue. "<br/>"; $this-$propName=$propValue; }        }$employee=NewEmployee ();$employee->name = "Mario";$employee->title = "Exective Chef";Echo $employee-title;//Output//$name =mario//$propName = title//$propValue = exective Chef

__set () method is the default, I tested, I do not write __set () method, can also implement

$employee->sex = ' M ';

Echo $employee->sex;

The __set () method can limit the setting of some properties, such as:

<?PHPclassemployee{var $name; function__set ($propName,$propValue)    {        if($propName= = ' age ') {            if($propValue< 18 | |$propValue> 60) {                $this-$propName=NULL; } Else {                $this-$propName=$propValue; }        } Else {            $this-$propName=$propValue; }    }}$employee=NewEmployee ();$employee->name = "Mario";$employee->age = "17";$employee->page = 1;Echo' name = '.$employee->name. ' <br/> ';Echo' Age = '.$employee->age. ' <br/> ';Echo' page = '.$employee-page;//output employee is less than 18 or greater than 60 when age=null//name = mario//Age =//page = 1

Get Properties with _ _get () method

boolean __get ([string property_name])

Test

Conclusion:

__set () and __get () are not only too long when the attributes are present. Test examples are as follows

<?PHPclassemployee{ Public $name;  Public $city; protected $wage; function__set ($propName,$propValue)    {        Echo"__set called!<br/>";$this-$propName=$propValue; }        function__get ($propName)    {        Echo"__get called!<br/>"; $vars=Array(            "Name", "City"        ); if(In_array($propName,$vars)) {            return $this-$porpName; } Else {            return"No such variable!"; }    }        }$employee=NewEmployee ();$employee->name = "Mario";$employee->city = "Shan";Echo $employee->name. "<br/>";Echo $employee-City . "<br/>";//Output//mario//Shan

Under Add code,

$employee->age =; Echo $employee->age. "<br/>"; // Output//__set called!// Echo $employee->sex. "<br/>"; // Output//__get called!//No such variable!

If you add sex to the $vars array, the program error!

Look down feel no bright spots, not used up.

"PHP and MySQL Program design" chapter sixth