Upgrade or install 2.7 clean urls defect with magic quotes

[matthijs]

When

a) in the PHP settings both magic_quotes_runtime and magic_quotes_sybase are set to ON,
b) upgrading from a previous (working) 2.6.5 version or installing a new version

The clean urls functionality is lost.

The bug is that in the wp_options the field rewrite_rules will then contain a wrong value: for example:
a:304:{s:12:"robots.txt$"; etc etc

changing this manually in the database to

a:304:{s:11:"robots.txt$";

will temporarily solve the bug, until a save is done in the permalinks. Then again this value gets the wrong value.

Setting magic_quotes_runtime and magic_quotes_sybase to Off also solves the issue. But my guess is that most people encountering this problem will not know that or might even not be able to change this setting (shared hosts). It might be better to check in the wordpress code to see how these PHP settings are and code accordingly

Linking back to forum posts:

​http://wordpress.org/support/topic/228380 and ​http://wordpress.org/tags/27permalinks

Looks like [9650] triggered this.

When magic_quotes_sybase is On, addslashes() does not escape backslashes.

(In [10286]) Turn off magic_quotes_sybase. It prevents addslashes from escaping backslashes. fixes #8757 for trunk

(In [10287]) Remove debug. see #8757

(In [10288]) Turn off magic_quotes_sybase. It prevents addslashes from escaping backslashes. fixes #8757 for 2.7