PHP - 没有语音标记的MySQL查询

$queryDetails = mysql_query("SELECT * from members WHERE username = '$current_url' ");

I'm trying to use fwrite to create a page on register. This is the only thing what is going wrong. As I'm using 'fwrite', I cannot use speech marks as it ends the 'fwrite' command.
I've tried escaping the query out;

$queryDetails = mysql_query('SELECT * from members WHERE username = \'$current_url\' ');

But that hasn't worked. I can't use " as it closes the fwrite. Any help?

The full code is

$queryDetails = mysql_query('SELECT * from members WHERE username = \'$current_url\' ');
$queryNumRowsDetails = @mysql_num_rows($queryDetails);

if ($queryNumRowsDetails != 0){

    //collect data from SQL database
    while ($row = mysql_fetch_assoc($queryDetails)){
        $dbUsername = $row['username'];
        $dbClub = $row['club'];
        $dbReputation = $row['reputation'];
    }

}
else{
    die("There was a problem gathering user data.");
}

And if I try to escape the ' as shown in the second code block. It goes to the "There was a problem gathering user data."

$current_url is a variable collecting the current URL and taking away a few bits, leaving only a username remaining. Meaning example.com/users/AdziHades/index.php equates to just AdziHades.

Though your question lacks the information indicating what's not working, it looks like your problem with the query might be that you're using single quotes and trying to have it evaluate the variable inside. For example:

$myvar = 2;
$mystring = "I have $myvar apples.";

In that code, $mystring would evaluate to I have 2 apples.. If, instead, you use single quotes, like so:

$myvar = 2;
$mystring = 'I have $myvar apples.';

You will get I have $myvar apples.'. This is because single quotes will not evaluate variables automatically. Note: I am NOT referring to the quotes used in the query itself (around $current_url), I'm talking about the quotes around the entire query.

You have two options here. The 'easy' option is to just concatenate the value of the variable. The better, more future-proof way is to switch to using prepared statements with PDO (here is a page that explains why you should be using this and how to use it or at least mysqli. Prepared statements will allow for more secure queries without you having to manually escape your values to prevent SQL injection. I highly recommend you look at going down this route. The mysql_* extensions you're using have been deprecated and will most likely cause you problems in the future.