Php File handling unable to write

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PHP

Hello Friends...


I am very new to php just starting learning from internet. I seen some examples for file handling. But when I'm following the same procedure to **file writing** it's not working.

The Reading function is working file. But writing to a file isn't working. I have also tried to use **file_put_content** function to write. :(

<?php
    if(isset($_POST['submit1'])){
    $fileName = "Text.txt";
    $fh = fopen($fileName,"a") or die("can not open the file to write");

    //Writing to a file
    $newData = "Hello This is new Data";
    fwrite($fh,$newData);
    fclose($fh);

    //Reading a file -- Working
    $text = fopen("Text.txt","r") or die ("can not open the file to read");
    while(!feof($text))
    {
        $myLine = fgets($text);
        print $myLine;
    }
    fclose($text);
    }

?>

Please Guide me..
Thanks