Is it possible to run php method on property change? Like shown in the example below:
Class:
class MyClass
{
public MyProperty;
function __onchange($this -> MyProperty)
{
echo "MyProperty changed to " . $this -> MyProperty;
}
}
Object:
$MyObject = new MyClass;
$MyObject -> MyProperty = 1;
Result:
"MyProperty changed to 1"
Like @lucas said, if you can set your property as private within the class, you can then use the __set() to detect a change.
class MyClass
{
private $MyProperty;
function __set($name, $value)
{
if(property_exists('MyClass', $name)){
echo "Property". $name . " modified";
}
}
}
$r = new MyClass;
$r->MyProperty = 1; //Property MyProperty changed.
You can achieve this best by using a setter method.
class MyClass
{
private MyProperty;
public function setMyProperty($value)
{
$this->MyProperty = $value;
echo "MyProperty changed to " . $this -> MyProperty;
}
}
Now you simply call the setter instead of setting the value yourself.
$MyObject = new MyClass;
$MyObject -> setMyProperty(1);
Using the magic method __set:
class Foo {
protected $bar;
public function __set($name, $value) {
echo "$name changed to $value";
$this->$name = $value;
}
}
$f = new Foo;
$f->bar = 'baz';
It may be a better and more conventional idea to use a good old-fashioned setter instead:
class Foo {
protected $bar;
public function setBar($value) {
echo "bar changed to $value";
$this->bar = $value;
}
}
$f = new Foo;
$f->setBar('baz');
This post is quite old, but I have to deal with the same issue and a typical class with multiple fields. Why using private properties ? Here is what I implemented :
class MyClass {
public $foo;
public $bar;
function __set($name, $value) {
if(!property_exists('MyClass', $name)){ // security
return;
}
if ('foo' == $name) { // test on the property needed to avoid firing
// "change event" on every private properties
echo "Property " . $name . " modified";
}
$this->$name = $value;
}
}
$r = new MyClass();
$r->bar = 12;
$r->foo = 1; //Property foo changed.
var_dump($r);
/*
object(MyClass)[1]
public 'foo' => int 1
public 'bar' => int 12
*/
