[TYPO3-core] RFC: fix dependency on PHP 4.3 in t3lib_db

[Michael Stucki]

Hi Martin,

>> Problem: While mysql_real_escape_string is the best way to escape DB
>> values it's only available since PHP 4.3 and it needs a valid link
>> identifier.

No, it doesn't need the link identifier. It is optional, and if it is not
specified, PHP will use the last link openend by mysql_connect (see
http://ch.php.net/mysql_real_escape_string).

>> Solution: Test link and fallback to mysql_escape_string.
>> 
>> Note: I'm not sure if we really need the link test as none of the
>> other functions do it. Anyway I think the initialization to FALSE
>> doesn't hurt.

I don't think it is needed, because: If there is really no link, TYPO3 will
fail anyway right after the next DB operation...

The patch is fine but I would like to have the link check removed -
otherwise it should be implemented in _every_ function to have it
consistent.

- michael
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