ID: 12775
Updated by: jeroen
Reported By: [EMAIL PROTECTED]
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($this)" to change the assignment semantics for an object it
would be a great way to maintain backward compatibility but let new objects be
assign-by-reference.
Anyway, the following function will do a deep copy of the object to get around this
bug (if you didn't use the words "shallow copy" I wouldn't have thought of it):
function copy_object($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).
------------------------------------------------------------------------
Edit this bug report at http://bugs.php.net/?id=12775&edit=1
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