Description:
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http://php.net/manual/en/function.intval.php
said: The maximum signed integer value for 64 bit systems is 9223372036854775807. 

but I test it on Win7x64 and Win2008R2x64 ent,
result is 2147483647

please tell me why??

My php version is this：
http://windows.php.net/downloads/releases/php-5.6.9-nts-Win32-VC11-x64.zip

My windows version is: 
Windows Server 2008R2 Enterprise 64bit
Version 6.1(7601 Service Pack1)

Test script:
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<?php
var_dump(intval('30000000000'));

Expected result:
----------------
int 30000000000

Actual result:
--------------
int 2147483647