zend.ze1_compatibility_mode
 

Has anybody here run into problems with using SimpleXML and having it produce an error in regards to zend.ze1_compatibility_mode?

It would seem according to php.net that ze1_compatibility is supposed to default to off, but a few random folks have it turned on. If you're running a script with, say, an xml language pack (as discussed in an article on this web site), you may want to look into adding the following directive, just to cover yourself in those few instances where somebody may have it turned on:

ini_set('zend.ze1_compatibility_mode', '0');

zend.ze1_compatibility_mode is one of the horrible features thats finally been deprecated in 5.3 and will produce an E_DEPRECATED warning if on, thank god =P