About fwrite in php

Question

I am creating file in php by using fwrite. I need to attach the database to my index.php My doubt is can I print the below line on fwrite? I have tried it but it shows error. Is there any way for this?

$fd =fopen("database.php","w");

fwrite($fd, "$dbhost='localhost';
    $dbuser='$user';
    $dbpass='$pass';
    $dbname='$email';
    $dbh = new PDO('mysql:host=localhost;dbname=$email', $dbuser, $dbpass);");

fclose($fd);

Answer 1

It's showing errors because the variables aren't escaped. To fix this issue, either swap out the quote markes with single quote marks or add a backslash () infront of $.

$fd=fopen("database.php","w");

fwrite($fd,"\$dbhost='localhost';
\$dbuser='\$user';
\$dbpass='\$pass';
\$dbname='\$email';

\$dbh=newPDO('mysql:host=localhost;dbname=\$email',\$dbuser,\$dbpass);");

fclose($fd);

Or the quote mark fix:

fwrite($fd, '$dbhost="localhost";
$dbuser="$user";
$dbpass="$pass";
$dbname="$email";

$dbh = new PDO("mysql:host=localhost;dbname=$email", $dbuser, $dbpass);');

Both should work.

If you want to pass variables to the text (like $user, $pass, $email), don't escape them.

$fd=fopen("database.php","w");

fwrite($fd,"\$dbhost='localhost';
\$dbuser='$user';
\$dbpass='$pass';
\$dbname='$email';

\$dbh=newPDO('mysql:host=localhost;dbname=$email',\$dbuser,\$dbpass);");

fclose($fd);

Quote version:

fwrite($fd, '$dbhost="localhost";
$dbuser="' . $user . '";
$dbpass="' . $pass . '";
$dbname="' .$email . '";

$dbh = new PDO("mysql:host=localhost;dbname=' . $email . '", $dbuser, $dbpass);');

Answer 2

What error(s) do you get? Did you declare all the vars?

If you do $dbuser='$user' between "", then php thinks the vars already exist, so if they don't you get errors.

The thing you are trying is not really possible.