PHP实例：php中getservbyport与getservbyname函数用法实例

string getservbyport ( int $port , string $protocol )
 
*/
$services=array('80','21','22','23','25','143');      //定义数组
foreach($services as $service)         //循环读取内容
{
  $protocol=getservbyport($service,'tcp');       //返回端口号对应的协议
  echo $service.":".$protocol."<br/>n";       //输出结果
}
 
/*
int getservbyname ( string $service , string $protocol )
*/
 
$services=array('http','ftp','ssh','telnet','imap',
'smtp','nicname','gopher','finger','pop3','www');       //定义一个数组
foreach($services as $service)          //循环读取内容
{
  $port=getservbyname($service,'tcp');        //获取数组元素对应端口
  echo $service.":".$port."<br/>n";         //输出结果
}