Posted by FFMG on 11/19/07 08:15

Hi,

I am slowly moving my code to php5.
But I would like to make it backward compatible in case something bad
happens, (and to make sure I understand what the changes are).

The way the constructors work seem to have changed quite a bit and I am
not getting the same behavior across the versions.

// Some simple code/
<?php
class TestClass
{
function TestClass() // For php4
{
$this->__construct();
}

var $_classValue = '';
function __construct()// For php5 && 4
{
global $globalValue;
$globalValue = $this;

// I use a random to make certain we are talking about the same
class.
$this->_classValue = md5(uniqid(mt_rand()));
}

function __destruct()
{
}

function setObject( )
{
global $globalValue;
$globalValue = $this;
}
}

global $globalValue;
$globalValue = null;

$testClass = new TestClass();

var_dump( $globalValue );
echo "<br />----- <br /><br />\n";

$testClass->setObject();
var_dump( $globalValue );
echo "<br />----- <br /><br />\n";

var_dump( $testClass );
echo "<br />----- <br /><br />\n";
?>
// ------------------------

The output in php5 is, (I think as expected).

object(TestClass)#1 (1) { ["_classValue"]=> string(32)
"352f867d5651b612ea3448c7a753e2cc" }
-----
object(TestClass)#1 (1) { ["_classValue"]=> string(32)
"352f867d5651b612ea3448c7a753e2cc" }
-----
object(TestClass)#1 (1) { ["_classValue"]=> string(32)
"352f867d5651b612ea3448c7a753e2cc" }
-----

But the output in php4 is not correct.
It is as if the class is not yet constructed.

object(testclass)(1) { ["_classValue"]=> string(0) "" }
-----
object(testclass)(1) { ["_classValue"]=> string(32)
"53b6f8088bd3c099e5b2b29e4f1361b2" }
-----
object(testclass)(1) { ["_classValue"]=> string(32)
"53b6f8088bd3c099e5b2b29e4f1361b2" }
-----

How would you fix the code so that i can set $globalValue as a
reference of $testClass in the constructor?

Thanks

FFMG


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