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

[Martin Kutschker]

This is a CVS patch request

Branch: HEAD or TYPO3_4-0

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.

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.

Masi

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