【造成原因】:Because PHP"s integer type is signed, and many IP addresses will result in negative integers.
【解决办法】:其官方手册中提到,可以“you need to use the "%u" formatter of sprintf() or printf() to get the string representation of the unsigned IP address”
即,printf( "%u", ip2long( "IP地址" ) );
或者将其先转换为二进制然后在转换为十进制,bindec( decbin( ip2long( "IP地址" ) ) );
【测试】
$strIp = "182.118.0.0";
echo ip2long($strIp); //此时输出的-1233780736
echo "<br/>";
echo bindec( decbin( ip2long( $strIp ) ) ); // 输出3061186560,与MySQL函数输出一致~
【注】:
number bindec ( string $binary_string ); //二进制转换为十进制
string decbin ( int $number ); //十进制转换为二进制