For a pair programming session, a server to accept and return key value pairs

Recurse server program

<?php
set_time_limit(0);

/* works with GET or POST, one key pair only :-(
curl -d '{"path":"/set","query":{"color":"green"}}' -X POST http://localhost:4000
curl -d '{"path":"/get","query":{"key":"color"}}' -X POST http://localhost:4000

localhost:4000/set?color=green
localhost:4000/get?key=color

you can set with GET and retrieve with POST as long as the server stays on
or you can set with POSt and retrieve with GET etc. 
*/

$address = '127.0.0.1';
$port = 4000;

$sock = socket_create(AF_INET, SOCK_STREAM, 0);
$bound = false;
$i=0;

$virtualDB = [];  // virtual database for key pairs

while (!$bound) {
    $bound = @socket_bind($sock, $address, $port);
    $i++;
    if ($i>10) die('Could not bind to port'."\n");
    if ($bound) break;
    echo 'retrying ...' . "\n";
    sleep(10);
}

echo "\n Listening on port $port For Connection... \n\n";

while(1) {
    socket_listen($sock);
    $client = socket_accept($sock);

    $input = socket_read($client, 1024);
    
	echo 'read it'. "\n"; 
    $incoming = array();
    
    $incoming = explode("\r\n", $input);

    $fetchArray = array();
    $fetchArray = explode(" ", $incoming[0]);
    
    $reqType = $fetchArray[0];
    if (strtolower($reqType) == "post")  {
    	$route = $incoming[7];
    	$url_parts = json_decode($route, true);
    	$query=$url_parts['query'];
    }
    else {
    	 $route = $fetchArray[1];
    	 $url_parts = parse_url($route);
    	 $url_parts = parse_url($route);
    	 $query = [];
    	 if (isset($url_parts['query']) ) parse_str($url_parts['query'], $query);
    }
    
    // /?key=  if value then save key and value
    //          else return value or error
    
    $output = 'no action indicated';
    
    switch ($url_parts['path']) {
    	case "/set":
	    $keys = array_keys($query);
	    if ($keys) {
		$virtualDB[$keys[0]] = $query[$keys[0]];
		$output = "key pair stored {$keys[0]} = {$virtualDB[$keys[0]]}";
	    } else $output = "need a key pair!";
    	break;
	
    	case "/get":
	    $key = $query['key'];
	    if ($key && array_key_exists($key, $virtualDB) )
		$output = $key . ' = ' . $virtualDB[$key] . ' retrieved from storage';
	    else $output = 'no key found';
    	break;
	
    	default:
    	    $output = 'no action indicated';
    }
    
    echo $reqType . " Request " . $route . "\n"; 

    $Header = "HTTP/1.1 200 OK \r\n" .
	"Date: Fri, 31 Dec 1999 23:59:59 GMT \r\n" .
	"Content-Type: text/html \r\n\r\n";

    if (strpos($route,"favicon.ico") === false) {
	$Content = str_replace("\n","<br>",$output);
	$output = $Header . $Content ;

	socket_write($client,$output,strlen($output));
	socket_close($client);
    }
}

/* not working ... :-( */
socket_shutdown($sock, 2);
socket_close($sock);
?>