Bug #14134 Updated: Literal -2147483648 should be an int, not a double.

ID: 14134 User updated by: at217@chebucto.ns.ca Reported By: at217@chebucto.ns.ca Status: Analyzed Bug Type: Scripting Engine problem Operating System: Linux PHP Version: 4.0.6 Old Assigned To: derick Assigned To: New Comment: Derick, Can you tell me where this code is so I can have a look? I'm a little confused about your comment about conversion to unsigned integers. First, I believe strtol converts to a signed integer (and, as used in intval, it does work correctly). But 2147483648 actually is a valid unsigned long. If the conversion is failing, it must be trying to convert to a signed integer. As for the workaround, creating constants INT_MIN and INT_MAX is exactly what I did, although you still have to be careful when creating INT_MIN. It must be something like: define( "INT_MIN", -2147483647 - 1 ); define( "INT_MAX", 2147483647 ); Previous Comments: ------------------------------------------------------------------------ [2001-11-26 02:37:19] derick@php.net Ok, as I have no time to look into a fix (if it's even do-able), I'll explain here why it happens: The parser embedded in PHP, does not take "-2147483648" as a string to convert (with strtol) to a unsigned integer, but it instead does this: 1. it tries to convert "2147483648" to a unsigned integer (which fails) 2. it tries to substract this from 0, ie. 0 - 2147483648. Because the conversion to a unsigned long fails in the first step, it gets converted to a floating point number, which is substracted from 0. A way to solve this can be to add constants for these outher limits, ie. INT_MIN (for -2147483648) and INT_MAX (for 2147483647). Derick ------------------------------------------------------------------------ [2001-11-20 03:31:18] derick@php.net Found the problem. I'll try to make a fix this evening. Derick ------------------------------------------------------------------------ [2001-11-20 03:02:55] derick@php.net Checking this out ------------------------------------------------------------------------ [2001-11-20 02:34:05] at217@chebucto.ns.ca When assigning the value -2147483648 to a variable, the variable becomes a double, even though the value is within the range of integers. In fact, assigning -2147483647 - 1 works, as does using intval("-2147483648"). The following script demonstrates, and can be accessed at <http://www.randomsample.org/tests/test-int-min.php>. <?php $int_max = 2147483647; $int_min = -2147483648; $int_min_alt = -2147483647 - 1; ?> <html><head><title>Test INT_MIN</title></head> <body> <p>Type of "2147483647": <?php echo gettype( $int_max ); ?> (value = <?php echo $int_max; ?>)</p> <p>Type of "-2147483648": <?php echo gettype( $int_min ); ?> (value = <?php echo $int_min; ?>)</p> <p>Type of "-2147483647 - 1": <?php echo gettype( $int_min_alt ); ?> (value = <?php echo $int_min_alt; ?>)</p> </body> </html> This is an ISP-provided build, but the configure line from phpinfo() is: './configure' '--with-config-file-path=/etc' '--enable-safe-mode=yes' '--enable-force-cgi-redirect=yes' '--with-gdbm' '--with-mysql' '--with-exec-dir=/www/cgi-bin' '--bindir=/www/cgi-bin' '--enable-ftp' '--enable-trans-sid' '--with-gd=/usr' '--with-zlib=/usr' '--with-jpeg-dir=/usr' '--enable-gd-native-ttf' '--with-png-dir=/usr' '--with-ttf=/usr/lib' ------------------------------------------------------------------------ Edit this bug report at http://bugs.php.net/?id=14134&edit=1