$_SERVER['REMOTE_ADDR'] 来获取用户的 IP 地址。，，``php，，``$_SERVER['REMOTE_ADDR'] 来获取用户的 IP 地址。，，``php，，``$_SERVER['REMOTE_ADDR'] 来获取用户的 IP 地址。，，``php，，``gethostbyname() 函数来查询域名的 IP 地址。，，``php，$domain = "example.com";，$ip = gethostbyname($domain);，echo "The IP address of $domain is $ip";，``gethostbyname() 函数来查询域名的 IP 地址。，，``php，$domain = "example.com";，$ip = gethostbyname($domain);，echo "The IP address of $domain is $ip";，``WHERE 子句来实现条件查询。以下是一个简单的示例：，，``php，，``，，这个示例展示了如何通过年龄大于 25 的条件来查询用户表中的记录。Powered By Z-BlogPHP 1.7.3
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