Re: [PHP] Why do I have to declare __set if I declare __get for read-only properties?
C Drozdowski wrote:
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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[PHP] Why do I have to declare __set if I declare __get for read-only properties?
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'
?
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