write to begining not end

[guest]

how can i make this script so that it writes to the begining of the text file not the end?

<?php
$logContent="file.txt"; 
	$log=fopen("$logContent", "a+");
	fputs($log, "i want this so go in the begining of the textfile its writing to\n");
	fclose($log);
?>

[Installer]

$txt = file_get_contents($your_file);
$txt = $new_txt . $txt;
$fp = fopen($your_file, 'w');
fwrite($fp, $txt);
fclose($fp);

[guest]

wait so how do mix those two scripts together?
----edit---
the file already exists so i dont need to make a new file i just need tp write to it....

[Installer]

$new_text = "i want this so go in the begining of the textfile its writing to\n";
$your_file = "file.txt";
$txt = file_get_contents($your_file); 
$txt = $new_txt . $txt; 
$fp = fopen($your_file, 'w'); 
fwrite($fp, $txt); 
fclose($fp);

[guest]

$new_text = "i want this so go in the begining of the textfile its writing to\n";
$your_file = "file.txt";
$txt = file_get_contents($your_file); 
$txt = $new_txt . $txt; 
$fp = fopen($your_file, 'w'); 
fwrite($fp, $txt); 
fclose($fp);

ok i got it to work without the "$txt = $new_txt . $txt; " but when i take that out it deletes everything in the file so im guessing that was what made it not clear out the whole text file, so is "$txt = $new_txt . $txt; " the right thing? cause nothing happens when i include that in the file

[Installer]

// $new_text is what you want to add to the beginning of the file
$new_text = "i want this so go in the begining of the textfile its writing to\n"; 
// $your_file is the file that has the text in it that you want to prepend $new_text to
// Also it's the file you'll be writing to
$your_file = "file.txt";
// The next line reads all the contents of $your_file into the variable $txt 
$txt = file_get_contents($your_file);
// The next line prepends $new_txt to $txt  

$txt = $new_txt . $txt;
// fopen() with the 'w' opens the file and deletes everyting in it  

$fp = fopen($your_file, 'w');
// The next line writes the entire string, new text and old, into the file  

fwrite($fp, $txt);
// fclose() closes the file  

fclose($fp);