#48496 [Bgs->Opn]: String to numerical conversion

ID: 48496 Updated by: rquadling@php.net Reported By: headden at karelia dot ru -Status: Bogus +Status: Open Bug Type: Documentation problem Operating System: Irrelevant PHP Version: Irrelevant -Assigned To: +Assigned To: rquadling Previous Comments: ------------------------------------------------------------------------ [2009-06-09 06:59:55] headden at karelia dot ru > As 1234567890123 is larger than a 32bit integer, it is converted to a float. I understand what and why happens in described case. The bug is not in PHP engine, but in documentation which does not describe this case. According to documentation "1234567890123" will be treated as 'integer' causing unpredictable truncation/overflow prior to evaluating + operator. I.e. the original phrase "The string will be evaluated as a float if it contains any of the characters '.', 'e', or 'E'. Otherwise, it will be evaluated as an integer." should be changed to something like this: "If the string does not contain any of the characters '.', 'e', or 'E' and implied numeric value fits into integer type limits, the string will be evaluated as an integer. In all other cases it will be evaluated as a float." ------------------------------------------------------------------------ [2009-06-08 14:55:26] rquadling@php.net Sorry, but your problem does not imply a bug in PHP itself. For a list of more appropriate places to ask for help using PHP, please visit http://www.php.net/support.php as this bug system is not the appropriate forum for asking support questions. Due to the volume of reports we can not explain in detail here why your report is not a bug. The support channels will be able to provide an explanation for you. Thank you for your interest in PHP. ------------------------------------------------------------------------ [2009-06-08 14:55:11] rquadling@php.net As 1234567890123 is larger than a 32bit integer, it is converted to a float. Once in a float it is quite happily allowed to be incremented as you are using. ------------------------------------------------------------------------ [2009-06-08 14:31:10] headden at karelia dot ru Description: ------------ http://www.php.net/manual/en/language.types.string.php "The string will be evaluated as a float if it contains any of the characters '.', 'e', or 'E'. Otherwise, it will be evaluated as an integer." this statement is wrong, consider the following code: $a = 1 + "1234567890123"; var_dump($a); // outputs 'float(1234567890124)' on a 32-bit platform this means that "1234567890123" was treated as 'float' although it does not have any of '.', 'e' or 'E' characters. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=48496&edit=1