#24381 [Com]: Inconsistence behavior of var_dump

ID: 24381 Comment by: marcot at tabini dot ca Reported By: yipkeikwok at yahoo dot com Status: Bogus Bug Type: Math related Operating System: Windows 2000, Redhat Linux 9 PHP Version: 4.3.2 New Comment: It actually *is* expected (albeit possibly incorrect) behaviour on behalf of the engine: http://bugs.php.net/bug.php?id=14134 Basically, what's happening is that $int1 = -2147483648; is being interpreted as $int1 = 0 - 2147483648; Since 2147483648 cannot be represented as an integer value, it (and, therefore, the result of the expression) is converted to double. Previous Comments: ------------------------------------------------------------------------ [2003-06-28 19:20:14] yipkeikwok at yahoo dot com If the lower bound for the type "integer" is -2147483648, then, according to http://www.php.net/manual/en/language.types.integer.php ,var_dump() should have returned -2147483648 as int-typed instead of float-typed. The actual result now is float(-2147483648) --Yipkei Kwok Integer overflow If you specify a number beyond the bounds of the integer type, it will be interpreted as a float instead. Also, if you perform an operation that results in a number beyond the bounds of the integer type, a float will be returned instead. ------------------------------------------------------------------------ [2003-06-28 19:05:07] pollita@php.net Your "expected result" is based on an incorrect assumption. The lower bound for type "integer" on a 32bit platform is in fact -2147483648. ------------------------------------------------------------------------ [2003-06-28 18:51:35] yipkeikwok at yahoo dot com Description: ------------ The function var_dump() returns different data type for -2147483647 and -2147483647-1 --Yipkei Kwok Reproduce code: --------------- <?php $int1 = -2147483648; $int2 = -2147483647-1; var_dump($int1); var_dump($int2); ?> Expected result: ---------------- float(-2147483648) float(-2147483648) The lower bound for data type integer is -2147483647. So, -2147483648 (-2147483647-1) should be regarded as float. Actual result: -------------- float(-2147483648) int(-2147483648) However, -2147483648 (-2147483647-1) is regarded as int. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=24381&edit=1