ID: 12775
Updated by: jeroen
Status: Suspended
Bug Type: Scripting Engine problem
Operating System: All
PHP Version: 4.0.6
New Comment:

I always use a 'cool' workaround (forgot to mention it), it isn't extremely fast, it 
is simple... works on both objects, arrays, and mixes. It also preserves internal 
references ($obj->a =& $obj->b)

The workaround?

// $a = $b should have worked like this:
function deep_copy(&$a,&$b)
$a = unserialize(serialize($b));

Previous Comments:

[2001-08-16 16:44:45] [EMAIL PROTECTED]

Actually, that would be a nice feature.  If one could call a function on an object 
such as "make_reference($this)" to change the assignment semantics for an object it 
would be a great way to maintain backward compatibility but let new objects be 

Anyway, the following function will do a deep copy of the object to get around this 
bug (if you didn't use the words "shallow copy" I wouldn't have thought of it):

function copy_object($object)
        $copy = $object;
        $properties = get_object_vars($object);
        foreach($properties as $name => $value) {
                if (is_object($value)) $copy->$name = copy_object($value);
                else $copy->$name = $value;
        return $copy;


[2001-08-15 18:11:10] [EMAIL PROTECTED]

Shallow copying of objects and arrays bit you...

Will be fixed in PHP 5

Suspended (it could be called a 'feature' though...)


[2001-08-15 18:00:05] [EMAIL PROTECTED]

If you set a property of an object to a global variable, it is no longer possible to 
make a copy of that object! Every "copy" becomes a reference.  Example:

--/ snip /--

class foo
        function foo()
                $this->test = 'Test';
                $GLOBALS['test'] =& $this->test;

$obj1 = new foo();
$copyOfObj1 = $obj1;  // Should be a copy, but is reference

$obj1->test = "changed!";
echo $copyOfObj1->test.'<br>';

--/ snip /--

The result of this code is: "changed!" but it should be "Test".  $copyOfObj1 should be 
a copy of $obj1, but instead it acts like a reference.

If you unset $GLOBALS['test'] then it copies as it should.

This is a bug occurs in all versions of PHP4 on all platforms (from what I can tell).  


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