Gracefully degrade for PHP4

[nacin]

Looks like install.php, setup-config.php, and wp-load.php (possibly other locations) need to call wp_check_php_mysql_versions() before including any file beyond load.php.

[ryan]

The else case of wp-load.php can include load.php and call wp_check_php_mysql_versions(). That will fix the files that use wp-load.php such as install.php. setup-config.php already loads load.php so just needs a call to wp_check_php_mysql_versions().

[ryan]

+1

Nicely conservative for 3.2. We can investigate reducing the number of files that must parse with PHP4 in 3.3.

[nacin]

In [18374]:

wp_check_php_mysql_versions() during setup and install. see #17934.

[nacin]

In [18375]:

Mark a few files as needing to be parsable by PHP4 in order to show the proper error messages. Non-exhaustive. see #17934.

[nacin]

Can someone poke around on PHP4 to make sure we got everything?

[wpdavis]

I poked around a bit, tried several ways of getting in and and tried upgrading. Couldn't find any problems.