Re: are Predefined variables really predefined?

> include "$DOCUMENT_ROOT/file.php" > include "$DOCUMENT_ROOT/file.php" > include "$DOCUMENT_ROOT/file.php" > include "$DOCUMENT_ROOT/file.php" > include "$DOCUMENT_ROOT/file.php" > > example 2: > > $document_root = $DOCUMENT_ROOT; > include "$document_root /file.php" > include "$document_root /file.php" > include "$document_root /file.php" > include "$document_root /file.php" > include "$document_root /file.php" > > Now what I am asking you is to think in microseconds and tell me what is > faster? > > To be precise my question is: are Predefined Variables REALLY Predefined or > they do not exist unless you call them? They really are predefined, almost for sure. > If they don't then calling them twice should make your script slower then > assign it's value once to a *normal* variable and use it later all over the > script, right? You won't even be able to measure the difference, but adding a second variable to the lookup table instead of using the predefined one will slow down the variable lookup. Worrying about performance instead of maintenance for the bulk of your code is just wrong.