overwrite the text in text file

i need a little help i wrote a script in PHP that inputs data from form and write it to a text file it works but i want to remove hole data
for example i sent through form "i sent through form"
and if next time if i send "need help" it ll overwrite "need helprough form" red will be remain as it is
any help
code is bellow

<?
$receivedFromFlashData = $_POST['ID'];

$myTextFileHandler = @fopen("file.txt","r+");


$txtfileArray = @file("file.txt");

if($myTextFileHandler){
print("txtFile is opened\n");


$writeInTxtFile = @fwrite($myTextFileHandler,"$receivedFromFlashData");
if($writeInTxtFile){

$writeStatus = "writing to textfile was a succes";

print("&writeStatus=$writeStatus");


}else{
$writeStatus = "writing to textfile was a big failure";
print("&writeStatus=$writeStatus");
};
@fclose($myTextFileHandler);

}else{
print("opening txtfile has failed\n");
};
print("&receivedData=$receivedFromFlashData");
?>

PHP:

it overwrite the beginning of data not all data

 

try replacing "r+" on line 4 for "w"

 

if you want to overwrite just use 'w' instead of r+
if you want to add to the content use 'a'..

 

thanks for your help
using a and w mods problem is resolved