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Error Displaying One Line From A File

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I'm trying to make a script that randomly pulls one line out of a text file, replaces the wrod fname with the users input, and then outputs it into the web browser.  I've had loads of trouble with it since i'm not exactly pro with php, but i managed to get there in the end, and i've narrowed it down to one final error...It's displaying everything from a text file instead of just the one line. 
The code is attached below, i've tried adding implode and explode, i don't know how that was meant to work, but somebody suggested it on another forum.  Any help please?
Pretty desperate now, been bugging me for absolutely ages :(

[code]<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">


<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />

<title>Fact Generator</title>



<div align="center">

  <p>&nbsp;  </p>



if(isset($_POST['fname'])) {

    $fname = $_POST['fname'];

    $filename = "facts.php";

    $filedata = file($filename);


    $farray = str_replace(fname, $fname, $filedata[array_rand($filedata)]);

    foreach($filedata as $farray) {

        echo wordwrap($farray,50,"<br/>");    }







<p align="center">&nbsp;</p>

  <p align="center">&nbsp;</p>

  <p align="center">&nbsp;</p>

<p align="center" class="style4">Enter your name: </p>

<p align="center">

<form action="factgen.php" method="post" target="_self" />

  <input type="text" size="30" name="fname" value="<?php echo $fname; ?>"/>


<p align="center">

<input type="submit" value="Fact!" /></p>

<p align="center">&nbsp;</p>



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