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if($fd = fopen($filename, "a")){
    $message = stream_get_line(STDIN, 1024);
    $message = $message.":";
    echo $message;
    //fwrite($fd, $message);
    fclose($fd);
Or you can use rtrim function to remove line endings:
if($fd = fopen($filename, "a")){
    $message = fgets(STDIN);
    $message = rtrim($message, "\n\r") . ":";
    echo $message;
    //fwrite($fd, $message);
    fclose($fd);
        
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