What potential issues can arise when using fsockopen and fread for socket connections in PHP?

One potential issue when using fsockopen and fread for socket connections in PHP is that fread may not read the entire response from the socket, leading to incomplete data being processed. To solve this, you can loop fread until the entire response is read. 

$socket = fsockopen('example.com', 80, $errno, $errstr, 30);
if (!$socket) {
    echo "$errstr ($errno)<br />\n";
} else {
    $response = '';
    while (!feof($socket)) {
        $response .= fread($socket, 1024);
    }
    fclose($socket);
    echo $response;
}

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