如何在PHP中使用变量作为字符串？

Question

I am pretty new to PHP and am trying to use variables in a string, here is my code:

<?php
    $userName = $_GET['Username'];
    $message = $_GET['Message'];

    if($_POST['Submit']){ 
        $open = fopen("new.txt",'a'); 
        $text = "
________________________________________"+$userName+":"+$message+"
________________________________________";
        fwrite($open, $text); 
        fclose($open); 
        echo "File updated.<br />";  
        echo "File:<br />"; 
        $file = file("new.txt"); 
        foreach($file as $text) { 
            echo $text."<br />"; 
        }
    }
?>

Also, would I use 'a' for adding to a file? If not what would I use? Please help me, thanks in advance!

Answer 1

Use . instead of + for concatenation.

Or, you can just do:

$text = "
________________________________________$userName:$message
________________________________________";

or (to be slightly clearer to the parser):

$text = "
________________________________________{$userName}:{$message}
________________________________________";