php file insert

<html>
<head>
</head>
<body>
<?php
//john pfeiffer 18apr08  Will insert text into the middle of a file BUT create date will equal modified date
//r=readonly, r+=(r+w), w=overwrite-new, w+-overwrite&read-new, a=append(write), a+=append(r+w)
    $filename = "testfile.txt";     //contents should be 3 lines, test123, test456, test789

    if(file_exists($filename))                      //if the file actually exists
    {                    //the old way of getting contents  $buffer = implode("", file($filename));
        $fp = fopen($filename, 'r');                //open in read only mode
        $buffer = file_get_contents( $filename );   //put all the file contents into a string
        fclose($fp);                                //close the file pointer
    }

    $fp = fopen($filename, 'w');                    //open the file again (overwrite as blank)
    if (is_writable($filename))                     //check to see if we have write permission
    {
        $oldtext = "test456";                       //our target point in the file
        $newtext = $oldtext . "\ntestABC";          //clever concatenated replacement text
        $buffer = str_replace($oldtext, $newtext, $buffer); //handy replacement function
        fwrite($fp, $buffer);                       //write the "improved" file back
        fclose($fp);
    }
    else
    {   fclose($fp);
        clearstatcache();
        echo "Cannot write to ".$filename." - Check permissions.";
    }

?>
</body>
</html>

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