Ok as I understand it PHP5 uses a different hash algorithm from PHP 4

The reason I ask this is because I have just migrated my website from a PHP 4 host to a PHP 5 host and it has broken all my members passwords

I would guess the best way you can remidy this is send out a lost password email to everyone...

to allow them to reset their passwords.

I havent noticed any problems, when i switched to php 5 in my cpanel (i have dual host )

PHP becoming far more better . Better than equivalents.
Clear and a good article. Thanx a lot

wow. i like with this forum. i hope can learn about php .
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ebooktoyou.co.cc

I agree php is becoming better. The code is now more stable then ever. There are still a bit of flaws when it come to pear but a novice user should be fine.

PHP can only get better! it is an easy language to learn the basics with and can proform amazingly advanced tasks when you know how and can interact with alot of differant functions etc.

Go PHP Go PHP ...

Object Model
The new OOP features in PHP5 is probably the one thing that everyone knows for sure about. Out of all the new features, these are the ones that are talked about most!
Passed by Reference
This is an important change. In PHP4, everything was passed by value, including objects. This has changed in PHP5 — all objects are now passed by reference.
PHP Code:
$joe = new Person();
$joe->sex = ‘male’;$betty = $joe;
$betty->sex = ‘female’;echo $joe->sex; // Will be ‘female’
The above code fragment was common in PHP4. If you needed to duplicate an object, you simply copied it by assigning it to another variable. But in PHP5 you must use the new clone keyword.Note that this also means you can stop using the reference operator (&). It was common practice to pass your objects around using the & operator to get around the annoying pass-by-value functionality in PHP4.
Class Constants and Static Methods/Properties
You can now create class constants that act much the same was as define()’ed constants, but are contained within a class definition and accessed with the :: operator.
Static methods and properties are also available. When you declare a class member as static, then it makes that member accessible (through the :: operator) without an instance. (Note this means within methods, the $this variable is not available)
Visibility
Class methods and properties now have visibility. PHP has 3 levels of visibility:

1. Public is the most visible, making methods accessible to everyone and properties readable and writable by everyone.
2. Protected makes members accessible to the class itself and any subclasses as well as any parent classes.
3. Private makes members only available to the class itself.

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I could be wrong, but isn't one of the major differences the way that variables are now accessed? You now have to use e.g.

$variable = $_GET['variable'];
$variable = $_POST['variable'];

which increases the security. Maybe I'm dreaming this and it was actually PHP 3 -> 4 that made the change (in which case I'm due for some abuse...)

There are several differences between PHP4 and PHP5.
1.Unified constructor and Destructor.
2.Exception has been introduced.
3.New error level named E_STRICT has been introduced.
4.Now we can define full method definintions for a abstract
class.
4.Within a class we can define class constants.
5.we can use the final keyword to indicate that a method
cannot be overridden by a child