how can i print data coming from an udp server in php?

hi..my name is massimiliano...i need to make and app in PHP that recives udp packet (form a third part application) and send it to another php or html file that print the data send in real time.

i create the server that it should receive an udp message and extract the content into the variable $output

<?php
             
       set_time_limit(0);   
        $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
        socket_bind($socket, "127.0.0.1", 16516);    
    
        for( ; ; ){
               socket_recvfrom($socket, $packet, 1500, 0, $from, $port);
               $output = "MSG Ricevuto : $packet "; 
               echo "$output " ;
               
                socket_sendto($fp1, $output, strlen ($output), 0, $from, $port);
               //i think taht whit socket_sendto(...) i can send the message to my other file
        }
       // close socket
        socket_close($socket);
?>

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i try to make this file to print the data but it does not work..

<?php

 $fp1 = fsockopen("udp://127.0.0.1", 16516, $errno, $errstr);

 if (!$fp1) {
           echo "ERROR: $errno - $errstr<br />\n";
        }else{

        socket_recvfrom($fp1, $packet, 1500, 0, $from, $port);
        echo "stampa : $packet";
 }
?>

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someone can help me to make the part that print the data on browser? i need that the data are update when arrive a udp packet from the server...my thirs part app send packet UDP every second

thaks to everyone

Massimiliano