#1: I would say basically no, but see the "change log" section of www.php.net/preg_match for a few minor changes over time.
#3: Functionally, just checking for true/false should be fine, unless you want to capture "not found" (int 0) versus "error occurred" (Boolean false) and handle them separately.
"Please give us a simple answer, so that we don't have to think, because if we think, we might find answers that don't fit the way we want the world to be."
~ Terry Pratchett in Nation
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