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Homephp教程php手册探讨PHP函数ip2long转换IP时数值太大产生负数的解决方法

探讨PHP函数ip2long转换IP时数值太大产生负数的解决方法

Jun 13, 2016 am 11:50 AM
phpfunctionreasonDiscussnumerical valuemethodhourofsolvenegative numberConvert

【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 '
';
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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