Bug #64450 [Asn->Wfx]: mt_rand causes overflow within certain max value

Edit report at https://bugs.php.net/bug.php?id=64450&edit=1 ID: 64450 Updated by: ab@php.net Reported by: stefano dot baccianella at gmail dot com Summary: mt_rand causes overflow within certain max value -Status: Assigned +Status: Wont fix Type: Bug Package: *General Issues Operating System: Windows 7 64bit PHP Version: 5.4.13 Assigned To: ab Block user comment: N Private report: N New Comment: Reason: http://news.php.net/php.internals/66806 The function is documented to be able working in the int range. Except you've platform having true 64 bit long (which x64 windows is not), it's limited values within PHP_INT_MAX and (PHP_INT_MAX-1). Previous Comments: ------------------------------------------------------------------------ [2013-03-21 20:00:06] ab@php.net The following patch has been added/updated: Patch Name: bug64450.patch Revision: 1363896006 URL: https://bugs.php.net/patch-display.php?bug=64450&patch=bug64450.patch&revision=1363896006 ------------------------------------------------------------------------ [2013-03-21 14:03:29] ab@php.net The following patch has been added/updated: Patch Name: bug64450.patch Revision: 1363874609 URL: https://bugs.php.net/patch-display.php?bug=64450&patch=bug64450.patch&revision=1363874609 ------------------------------------------------------------------------ [2013-03-19 01:02:13] stefano dot baccianella at gmail dot com Description: ------------ When using mt_rand function using pow(10,12) as MAX parameter the function seems to get an overflow giving the warning: PHP Warning: mt_rand(): max(-727379968) is smaller than min(0) But the function works perfectly when using greater MAX value like pow(10,13) Below the diff of my php.ini and the php.ini-development provided by default: short_open_tag = On error_reporting = E_ALL & ~E_DEPRECATED & ~E_NOTICE include_path = ".;C:\Program Files (x86)\PHP\pear" extension=php_bz2.dll extension=php_curl.dll extension=php_gd2.dll extension=php_gettext.dll extension=php_mbstring.dll extension=php_mysql.dll extension=php_mysqli.dll extension=php_openssl.dll extension=php_pdo_pgsql.dll extension=php_pgsql.dll extension=php_apc.dll extension=php_sockets.dll ;extension=php_sqlite.dll extension=php_sqlite3.dll date.timezone = Europe/Rome [apc] [APC] apc.enabled = 1 apc.shm_segments = 1 apc.shm_size = 512M apc.num_files_hint = 1000 apc.user_entries_hint = 4096 apc.ttl = 0 apc.user_ttl = 0 apc.gc_ttl = 3600 apc.cache_by_default = 1 apc.filters = "apc\.php$" apc.mmap_file_mask = "/tmp/apc.XXXXXX" apc.slam_defense = 0 apc.file_update_protection = 2 apc.enable_cli = 0 apc.max_file_size = 10M apc.use_request_time = 1 apc.stat = 1 apc.write_lock = 1 apc.report_autofilter = 0 apc.include_once_override = 0 apc.localcache = 0 apc.localcache.size = 256M apc.coredump_unmap = 0 apc.stat_ctime = 0 apc.canonicalize = 1 Test script: --------------- <? echo mt_rand(0,pow(10,12)); echo mt_rand(0,pow(10,13)); ?> Expected result: ---------------- (a random number)(a random number) Actual result: -------------- PHP Warning: mt_rand(): max(-727379968) is smaller than min(0) (a random number) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=64450&edit=1