I just saw this on a newsgroup. I don't know what it means but you coder types might.
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PHP5 has just been released in its first stable version today. Because of licensing issues, PHP5 needs special configuration to run MySQL.
Fortunately, it's very easy:
In php.ini, remove the semicolon from the beginning of this line:
;extension=php_mysql.dll
Next, copy the libmysql.dll file from the PHP folder to your Windows system
directory (C:\windows\system32 or C\winnt\system32). Save php.ini, and
restart Apache. MySQL will be enabled in PHP5.
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David Powers
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Co-author, "PHP Web Development with Dreamweaver MX 2004" (Apress)