#50970 [Opn->Bgs]: force convert a string into int using (int) or intval() cause value truncate

ID: 50970 Updated by: rasmus@php.net Reported By: zhangsilly at gmail dot com -Status: Open +Status: Bogus Bug Type: Scripting Engine problem Operating System: Windows XP PHP Version: 5.2.12 New Comment: You need a true 64-bit OS if you want this to work. The integer datatype in PHP is a long. Your example works perfectly on 64-bit Linux. We can't fix this on 32-bit without turning the basic integer datatype into some sort of arbitrary precision hack which would probably be an order of magnitude performance hit for basic integer math. And frankly, the number of 32-bit web servers is falling at a rapid rate. Previous Comments: ------------------------------------------------------------------------ [2010-02-21 01:32:40] zhangsilly at gmail dot com This bug is still exists in the svn version. Hope you will test this code: echo '3740925952' + 1; //output 3740925953 echo (int) '3740925952' + 1; // output 2147483648 This bug is unacceptable. ------------------------------------------------------------------------ [2010-02-20 01:00:00] php-bugs at lists dot php dot net No feedback was provided for this bug for over a week, so it is being suspended automatically. If you are able to provide the information that was originally requested, please do so and change the status of the bug back to "Open". ------------------------------------------------------------------------ [2010-02-16 13:53:22] zhangsilly at gmail dot com To jani: Your PHP works fine on linux. Is your OS 64bit? I 'am sure , On Windows 32Bit, both of strtol and atol will truncate the value. ------------------------------------------------------------------------ [2010-02-16 13:37:20] zhangsilly at gmail dot com Thanks for your reply. For I am having my spring festeval, now my computer does'nt have a compiler, I can't test it. But I do download the source from http://snaps.php.net/php5.2-latest.tar.gz at 2010-02-16 21:19, chinese standard time, and check the source , I 'am sure the bug can be reproduced. See the file Zend/zend_operators.c, this bug is caused by the function: ZEND_API void convert_to_long_base(zval *op, int base) { char *strval; long tmp; switch (op->type) { case IS_NULL: op->value.lval = 0; break; case IS_RESOURCE: { TSRMLS_FETCH(); zend_list_delete(op->value.lval); } /* break missing intentionally */ case IS_BOOL: case IS_LONG: break; case IS_DOUBLE: DVAL_TO_LVAL(op->value.dval, op->value.lval); break; case IS_STRING: strval = op->value.str.val; op->value.lval = strtol(strval, NULL, base); STR_FREE(strval); break; See the enter point IS_STRING, it use strtol directly. The truncate was caused by the strtol. If you still use it directly, This bug will not be fixed. ------------------------------------------------------------------------ [2010-02-12 17:36:08] jani@php.net Please try using this snapshot: http://snaps.php.net/php5.2-latest.tar.gz For Windows: http://windows.php.net/snapshots/ Works fine for me with Linux.. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/50970 -- Edit this bug report at http://bugs.php.net/?id=50970&edit=1