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You should not use is_null, except when you need a callback-function, or for conformity with is_int, is_float, etc. note: this is because == tests for equivalence of value, but not type.Don't try to test if ($int Something==NULL) use is_null() instead. NULL evaluates to false, as does 0, so NULL == 0 is true--even though 0 is type int and NULL is type null.
NULL is supposed to indicate the absence of a value, rather than being thought of as a value itself.
id=x Nx ZAAAAc AAJ&printsec=frontcover&output=reader&hl=en&pg=GBS. PA1 SITE Google Books SUBJECT Eduication NOTES Dpr of the 1570 Leipzig edition AUTHOR Siber, Adam (1516-1584) TITLEURL SITE MDZ SUBJECT Education NOTES Dpr of the 1555 Strassburg edition (1559 Strassburg edition here) AUTHOR Siber, Adam (1516-1584) TITLE URL MATEO SUBJECT Poetry NOTES Dpr of the 1573 Leipzig edition AUTHOR Siber, Adam: see Christoph Schellenberg AUTHOR Siber, Adam Theodor (1563 - 1616) TITLEURL SITE MDZ SUBJECT Rhetoric NOTES Dpr of the 1601 Wittemberg edition AUTHOR Siber, Adam Theodor (1563 - 1616) TITLE Selections from Gruter's URL Servlet? benl-00676 AAUTHOR Spanheim, Friedrich TITLE URL https://play.google.com/books/reader?
Doc ID=662&Dv ID=647 SITE MIAMI (Universitäts - und Landesblbliothek Münster) SUBJECT Biography NOTES Dpr the 1710 Leipzig edition AUTHOR Siberus, Adam TITLE URL id=l AI_AAAAc AAJ&printsec=frontcover&output=reader SITE Google Books SUBJECT Religion, history NOTES Dpr of the 1683 Leiden edition AUTHOR Spanner, Andreas (1639-1694) TITLE URL Colleción Digital UANL SUBJECT Religion NOTES Dpr of the 1741 Venice edition AUTHOR Sparrman, Andreas: see Linnaeus AUTHOR Sparrowe, Thomas TITLE URL SITE The Philological Museum CONTRIBUTOR Dana F.
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Saving microseconds on a lot of "simple" operations in the entire PHP execution chain usually results in being able to serve more pages per second at the same speed, or lowering your cpu usage.
Otherwise it may lead to application failures and potential security issues where certain checks could be effectively disabled.