note 69083 added to ref.pdf

Here is a function to test whether a file is a PDF without using any external library. <?php function is_pdf($filename) { define('PDF_MAGIC', "\\x25\\x50\\x44\\x46\\x2D"); return (file_get_contents($filename, false, null, 0, strlen(PDF_MAGIC)) === PDF_MAGIC) ? true : false; } ?> It's not checking if the whole file is valid, just if the correct header is present at the beginning of the file. ---- Server IP: 216.194.113.175 Probable Submitter: 68.43.121.42 ---- X-Spam-Status: No, hits=3.1 required=5.0 tests=DATE_MISSING,FROM_NO_LOWER autolearn=no version=2.64 ---- Manual Page -- http://www.php.net/manual/en/ref.pdf.php Edit -- https://master.php.net/note/edit/69083 Del: integrated -- https://master.php.net/note/delete/69083/integrated Del: useless -- https://master.php.net/note/delete/69083/useless Del: bad code -- https://master.php.net/note/delete/69083/bad+code Del: spam -- https://master.php.net/note/delete/69083/spam Del: non-english -- https://master.php.net/note/delete/69083/non-english Del: in docs -- https://master.php.net/note/delete/69083/in+docs Del: other reasons-- https://master.php.net/note/delete/69083 Reject -- https://master.php.net/note/reject/69083 Search -- https://master.php.net/manage/user-notes.php