Howdy,
I'd like to access some of the private members of my classes as read-only properties without resorting to function calls to access them. (e.g. $testClass->privateMember instead of $testClass->privateMember(), etc)
Based on my research and testing, using the __get and __set overloading methods appears to be the only way to do so. It also, based on testing, appears that these private members must be in an array.
What I do not understand is that if I declare a __get method I MUST also declare a "do nothing" __set method to prevent the read-only properties from being modified in code that uses the class.
For example, the code below allows me to have read-only properties. However, if I remove the "do nothing" __set method completely, then the properties are no longer read-only.
I'm curious as to why I HAVE to implement the __set method?
Example:
<?php
class testClass { private $varArray = array('one'=>'ONE', 'two'=>'TWO');
public function __get($name) { if (array_key_exists($name, $this->varArray)) { return $this->varArray[$name]; } }
public function __set($name, $value) { }
}
$test = new testClass();
$test->one = 'TWO'; // doesn't work echo $test->one; // echo s 'ONE'
?>
If __set function is not created, line $test->one = 'TWO'; creates a new public variable with name 'one' and this one is echoed on the next line, not the one retrieved from __get.
__get is called only for class variables that do not exist.
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