Bug #52787 [NEW]: intval() returns incorrect int

From: Operating system: Windows & Linux PHP version: 5.3.3 Package: Math related Bug Type: Bug Bug description:intval() returns incorrect int Description: ------------ I was working on a way to calculate the LIMIT and OFFSET for a blog in reverse but still with ORDER BY date_create DESC and I kept running into flaws until i did a print on the mysql_query string,.. in order to keep the urls correct on the page,.. $postoffset = (((14 / 10) - 1) * 10); // 4 var_dump($postoffset); // returns float(4) var_dump(intval($postoffset)); // returns int(3) 14/10 = 1.4 1.4-1 = 0.4 0.4*10 = 4 (this is happening on many different php version, so i almost wanted to put the php version select on "Irrelavant") Test script: --------------- <?php header("Content-Type: text/plain"); $limit = (int) 10; $count = (int) 14; // mysql_query("select count(*)..."); $pages = (int) ceil($count/$limit); $page = (int) 1; $offset = ((($count / $limit) - $page) * $limit); var_dump($offset); var_dump(intval($offset)); $offset = (((14 / 10) - 1) * 10); // 4 var_dump($offset); var_dump(intval($offset)); var_dump(ceil(((14 / 10) - 1) * 10)); var_dump(floor(((14 / 10) - 1) * 10)); var_dump(round(((14 / 10) - 1) * 10)); print "- step by step -\n"; $pages = $count / $limit; var_dump($pages); // 1.4 var_dump(intval($pages)); // 1 $_page = $pages - $page; var_dump($_page); // 0.4 var_dump(intval($_page)); // 0 $offset = $_page * $limit; var_dump($offset); // 4 var_dump(intval($offset)); // 3 incorrect $offset = 0.4 * 10; var_dump($offset); // 4 var_dump(intval($offset)); // 4 correct ?> Expected result: ---------------- float(4) int(4) float(4) int(4) float(4) float(4) float(4) - step by step - float(1.4) int(1) float(0.4) int(0) float(4) int(4) float(4) int(4) Actual result: -------------- float(4) int(3) float(4) int(3) float(4) float(3) float(4) - step by step - float(1.4) int(1) float(0.4) int(0) float(4) int(3) float(4) int(4) -- Edit bug report at http://bugs.php.net/bug.php?id=52787&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=52787&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=52787&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=52787&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=52787&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=52787&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=52787&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=52787&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=52787&r=needscript Try newer version: http://bugs.php.net/fix.php?id=52787&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=52787&r=support Expected behavior: http://bugs.php.net/fix.php?id=52787&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=52787&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=52787&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=52787&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=52787&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=52787&r=dst IIS Stability: http://bugs.php.net/fix.php?id=52787&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=52787&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=52787&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=52787&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=52787&r=mysqlcfg