editing txt files with PHP

[benjy]

say i have a text file and at the top of it it just says

line 1 "blah blah blah blah"
line 2
line 3
etc

then i had a form like such

<form method="post" method="stuff.php">
<input type="text" name="soobajooba">
<input type="submit" name="submit" value="Submit">
</form>

theen the file stuff would printt out $soobajooba (using the fwrite() function in the txt file, but how do i ensure that the contents of $soobajooba would be inserted at the top of the txt file not at the bottom

[Mordecai]

Read the file before you write, and make sure to write with something that truncates the file length to zero. Then print back what was read.

[benjy]

i dont exactly understand what that means perhaps an example?

[Mordecai]

Sure.

$fp = fopen("file.txt","r+b");
$contents = fread("file.txt",filesize("file.txt");
fwrite("new information.\n".$contents);
fclose($fp);

[benjy]

for some reason this isnt working im getting and error like this

Parse error: parse error, unexpected ';' in /home/comesept/public_html/introverted/PHP/newblog.php on line 8

and i did get rid of that unexpected ';' but i still got an error....what do you think is the problem?

[bernouli]

$contents = fread("file.txt",filesize("file.txt"));