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【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
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