Question

How to use getprotobyname() function to get protocol number from protocol name in PHP

Answer 1

$protocol = getprotobyname('tcp');
   
echo $protocol;
   
/*
run: 

6 

*/

 

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Answer 2

$protocol = getprotobyname('udp');
   
if ($protocol === FALSE) 
    echo 'Invalid Protocol';
else 
   echo $protocol;
   
/*
run: 

17 

*/

 

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