【造成原因】：Because PHP's integer type is signed, and many IP addresses will result in negative integers.
【解決辦法】：其官方手冊中提到，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' ) );
或者將其先轉(zhuǎn)換為二進制然后在轉(zhuǎn)換為十進制，bindec( decbin( ip2long( 'IP地址' ) ) );
【測試】
$strIp = '182.118.0.0';

echo ip2long($strIp); //此時輸出的-1233780736
echo '<br/>';
echo bindec( decbin( ip2long( $strIp ) ) ); // 輸出3061186560，與MySQL函數(shù)輸出一致~

【注】：
number bindec ( string $binary_string ); //二進制轉(zhuǎn)換為十進制
string decbin ( int $number ); //十進制轉(zhuǎn)換為二進制