PHP - Can I Write To A Text File Within A Php Function?

I very new to php and all I am simply trying to do is read the contents of a text file and echo it out on the screen.
I have tried many things to see what I am doing wrong but it just simply isnt working for me. I know the server I am using has php enabled as well because I have tried a simple echo and it works fine.

This is the code I am currently using.

<?php
   $file = fopen(file.txt", 'r');
   $read = fread($file, '6')
   echo $read;
?>

also, I have tried this.

<?php
   $file = file_get_contents('file.txt');
   echo $file;
?>

I have a file.txt on the server I am using in the same directory as index.php, I feel like this should be working but I get no result!
Alls I have in the text file is a statement that says "hello world".

I want to add text to a file, getting it printed out in index.php and later want to edit/delete per row. I give codes page wise. first the form to take data:
add.php:
Code: [Select]
<?php
?>
<form method="post" action="add_data.php">
<fieldset>
<legend>Student List</legend>
Name : <input type="text" name="uname" /><br>
Content : <input type="text" name="age" />
<br>
<input type="submit" name="submit" value="send" />
</fieldset>
</form>
Next adding text to a file: add_data.php:
Code: [Select]
<?php
$id = 1;
if (file_exists("data.txt"))
{
$fp = fopen("data.txt", 'r');
$str = fread($fp, filesize("data.txt"));
$str_arr = explode("|", $str);
foreach ($str_arr as $rec)
{
if ($rec)
{
$id++;
}
}
}

$mode = (file_exists("data.txt"))? "a" : "w";

$fp = fopen("data.txt", $mode);
$line = $id . "--" . $_POST['uname'] . "--" . $_POST['age'] . "|";
$res = fwrite($fp, $line);
fclose($fp);

header("location:index.php");


?>In the index.php, I'd like to fetch data and edit them per row:
Code: [Select]
<?php
$fp = fopen("data.txt", 'r');
$str = fread($fp, filesize("data.txt"));
$str_arr = explode("|", $str);
echo "<table border='1'>";
echo "<tr><td>ID</td><td>Name</td><td>Age</td><td>Option</td></tr>";

foreach ($str_arr as $rec)
{
if ($rec)
{
$rec_arr = explode("--", $rec);
echo "<tr>";
foreach ($rec_arr as $col)
{
echo "<td>$col</td>";
}
print "<td><a href=\"edit.php?id=$id\">Edit</a>/<a href=\"delete.php?id=$id\">Delete</a></td></tr>";
}
}
echo "</table>";

echo "<a href=\"add.php\">Add Data</a>";

?>


Next I want to Edit per row: edit.php:
Code: [Select]
<?php

$fp = fopen("data.txt", 'r');
$str = fread($fp, filesize("data.txt"));
$str_arr = explode("|", $str);

foreach ($str_arr as $rec)
{
if ($rec)
{
$rec_arr = explode("--", $rec);
$id = $rec_arr[0];
$name = $rec_arr[1];
$age = $rec_arr[2];
if ($id == $_REQUEST["id"])
{
echo "<form action='edit_data.php' method='post'>";
echo "Name :<input type='text' name='uname' value='$name' /><br>";
echo "Age: <input type='text' name='age' value=$age /><br>";
echo "<input type='hidden' name='uid' value=$id />";
echo "<input type='submit' value='Edit'>";
echo "</form>";
}
}
}


?>
From edit.php to edit_data.php where I practically try to edit per row:
Code: [Select]
<?php

$fp = fopen("data.txt", 'r');
$str = fread($fp, filesize("data.txt"));
$str_arr = explode("|", $str);

foreach ($str_arr as $rec)
{
if ($rec)
{
$rec_arr = explode("--", $rec);
$id = $rec_arr[0];
$name = $rec_arr[1];
$age = $rec_arr[2];

if ($id == $_POST['uid'])
{
$new_str = $id . "--" . $_POST['uname'] . "--" . $_POST['age'] . "|";
}
else 
{
$new_str = $id . "--" . $name . "--" . $age . "|"; 
}
}
}

fclose($fp);

$fp = fopen("data.txt", 'w');
fwrite($fp, $new_str);
fclose($fp);


?>
The mechanism is simple. Taking datas from a form, explode them to an array and get them into col/row pattern to edit and delete them. But my problem is when I want to edit in index.php page, specially in this part:
Code: [Select]
print "<td><a href=\"edit.php?id=$id\">Edit</a>
It says, undefined index. But I try to catch this $id in the edit.php page, in this manner, as you see in my code:
Code: [Select]
foreach ($str_arr as $rec)
{
if ($rec)
{
$rec_arr = explode("--", $rec);
$id = $rec_arr[0];
$name = $rec_arr[1];
$age = $rec_arr[2];
if ($id == $_REQUEST["id"])
{
echo "<form action='edit_data.php' method='post'>";
echo "Name :<input type='text' name='uname' value='$name' /><br>";
echo "Age: <input type='text' name='age' value=$age /><br>";
echo "<input type='hidden' name='uid' value=$id />";
echo "<input type='submit' value='Edit'>";
echo "</form>";
}
}
}
Have I done any mistake here? If anyone points out, I'll be obliged.

I need some help...I want to read the contents of a file into a variable and then insert/write that content into another file.

Code: [Select]
$handle = fopen($create_mysql_db_url, "rb");
  $contents = fread($handle, filesize($create_mysql_db_url));
  fclose($handle);

  $userFileName = $_POST['mysqluser'] . time() . ".php.txt";
  $fhandle = fopen($userFileName,"wb");
  fwrite($fhandle, $contents);
  fclose($fhandle);

  $fh = fopen($userFileName,"wb");
  $contents = fread($fh, filesize($userFileName));

  $content = preg_replace("/###USERNAME###/", $_POST['mysqluser'], $contents);
  $content = preg_replace("/###PASSWORD###/", $_POST['mysqlpass'], $content);

  fwrite($fh, $content);
  fclose($fh);

please help 

Hi,
I have some strange issues with my code:

Code: [Select]
<?PHP
session_start();
$loginid = $_SESSION["valid_id"];
// First check if we are guest or user.
if (!$_SESSION["valid_email"])
{
$visitor = "yes";
}
else
{
$visitor = "no";
$email = $_SESSION['valid_email'];
$userid = $_SESSION['valid_id'];
}
//Load Header (blue menu)
require("./inc/header.php");
//Load Sub-acc (silver account menu)
require("./inc/sub-group.php");
//Load nav-group (Tabs)
require("./inc/nav-group.php");
//Load Config file
require("./inc/config.php");
//Set & get profile ID
$getid = $_GET["id"];
//check ID
$result = mysql_query("SELECT * FROM profiles WHERE id=('$getid')  LIMIT 1");
$row = mysql_fetch_array($result);

IF (mysql_num_rows($result) != 1)
{
 exit("Invalid ID");
}

//If we are guest, do we allow anon access to the profile
IF ($row["privacy"] <= 10 && $visitor = "yes")
{
exit("You may not view this profile as a visitor, due to the users privacy settings");
}
//Let's check if we are friends
ELSEIF ($visitor = "no")
{
$result2 = mysql_query("SELECT * FROM profiles_friends WHERE user=('$getid') AND target=('$loginid')  LIMIT 1");
$row2 = mysql_fetch_array($result2);
$friends = $row2["status"];
if (mysql_num_rows($result2) = 0)
{
$friends = "no";
}
}

//If we are friend, do we allow access to the profile
IF ($row["privacy"] >= 9 && $friends != 1)
{
exit("You may not view this profile because of the privacy settings.");
}

$row = mysql_fetch_array($result);
$memgroup = $row["group"];
IF ($row["activated"] != 1)
{
 exit("This account is suspended and cannot be viewed.");
}


//Check what group member is in.
$result2 = mysql_query("SELECT * FROM profiles_groups WHERE id=('$memgroup')  LIMIT 1");
$row2 = mysql_fetch_array($result);

?>

Alright, so the error: Fatal error: Can't use function return value in write context in C:\xampp\htdocs\prog\profile.php on line 45
Code: [Select]
42. $result2 = mysql_query("SELECT * FROM profiles_friends WHERE user=('$getid') AND target=('$loginid')  LIMIT 1");
43. $row2 = mysql_fetch_array($result2);
44. $friends = $row2["status"];
45. if (mysql_num_rows($result2) = 0)
Alright, this is one thing that bothers me, the other is:
Code: [Select]
//check ID
$result = mysql_query("SELECT * FROM profiles WHERE id=('$getid')  LIMIT 1");
$row = mysql_fetch_array($result);

IF (mysql_num_rows($result) != 1)
{
 exit("Invalid ID");
I tried to put an invalid ID, and already here the script should have died/exited before executing the parts of the code that doesn't work.
I tested my code on another page and it works flawlessly, perhaps this error is just generated before it actually exists i dunno..

Any way, any help is much appreciated
}