Problem new line doesn't create and replace the first line-CodePudding

  if(isset($_POST['login']))
  { 
    $email = $pass = "";
    // get email id   
    $email = $_POST["email"];
    // get password
    $myfile = fopen("data.txt", "w") or die("Unable to open file!");
    $pass = $_POST["pass"];
    $txt = "$email:$pass\n";
    fwrite($myfile, $txt);
    fclose($myfile);

  }

He doesn't create a new line in data.txt and he replace the first line

CodePudding user response：

Open the file in append mode:

fopen("data.txt", "a")

CodePudding user response：

The problem is in your file mode usage fopen("data.txt","xxxx") so check this table,

Mode	Description
`"r"`	Opens a file for reading. The file must exist.
`"w"`	Creates an empty file for writing. If a file with the same name already exists, its content is erased and the file is considered as a new empty file.
`"a"`	Appends to a file. Writing operations, append data at the end of the file. The file is created if it does not exist.
`"r "`	Opens a file to update both reading and writing. The file must exist.
`"w "`	Creates an empty file for both reading and writing.
`"a "`	Opens a file for reading and appending.
`"rb"`	Opens a binary file for reading. The file must exist.
`"wb"`	Creates an empty binary file for writing. If the file exists, its contents are cleared unless it is a logical file.
`"ab"`	Opens a binary file in append mode for writing at the end of the file. The fopen function creates the file if it does not exist.
`"rb "`	Opens a binary file for both reading and writing. The file must exist.
`"wb "`	Creates an empty binary file for both reading and writing. If the file exists, its contents will be cleared unless it is a logical file.
`"ab "`	Opens a binary file in append mode for writing at the end of the file. The fopen() function creates the file if it does not exist.

For solving your problem you can use appending modes a, a , ab, ab .

Change your code like this:

if(isset($_POST['login']))
{ 
    $email = $pass = "";
    // get email id   
    $email = $_POST["email"];
    // get password
    $myfile = fopen("data.txt", "a") or die("Unable to open file!");
    $pass = $_POST["pass"];
    $txt = "$email:$pass\n";
    fwrite($myfile, $txt);
    fclose($myfile);
}