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PHP 9.0 introduces several changes including better increment/decrement behavior, improved unserialization error handling, simplified function signatures, stricter array creation rules from false values, and simplified string interpolation. Additionally, warnings for undefined variables and properties will now become errors, and deprecated features from previous versions will be removed.

An early look at PHP 9.0's new features and changes

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I’m still wondering on why “Booleans and null will be treated as numbers”. Isn’t it still confusing although it is basically 1 and 0? I found it consistent, <code>true</code> should remains <code>true</code> and shouldn’t be changed under any conditions, unless changed to <code>false</code>.
Other deprecations and changes are fine to me.

PHP is getting better and better ;-)

Looking forward to this for my favorite language

I wonder what it’s meant by “simpler function signatures”? As of today we have name and arguments, basically. How simpler can it be from there?

I’m not sure I agree with allowing booleans and nulls being allowed to be incremented and decremented.
This seems like a step in the wrong direction.