MySQL was replaced by SQLite as the default database in the very first release of 5.0.0 http://www.php.net/ChangeLog-5.php#5.0.0b1
Yes.
The PRIMARY reason was because of the number of non MySQL users who requested that.
No. Will you please stop trying to rewrite history. There was an outcry when MySQL was unbundled - you were probably the only PHP user who was happy about it :)
- Steph
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