there is an error in my code but I can find what it is, can anyone help me

PHP Code:

<?php
include("header.php"); 
?>
<td class="td" valign="top">



<?php

$name = $_POST['name'];

$id = explode("=", $_POST['url']);

$no = explode("|", $_POST['pet']);

if ( $_POST[submit] == yes ) {
if ( $_POST[name] <= 0 ) {
  $form = 1;
    echo "You have to put a url in the box.<br>";
}
if ( $_POST[name] <= 0 ) {
  $form = 1;
    echo "You have to put a name in the box.<br>";
}
if ( $_POST[pet] <= 0 ) {
  $form = 1;
    echo "You have to choose a pet species.<br>";
}
else {

// Make a MySQL Connection
mysql_connect("mysql", "jolyza", "maddie") or die(mysql_error());
mysql_select_db("pettingpastures") or die(mysql_error());


mysql_query("INSERT INTO submissions (`id`, `name`, `no`, `img`) VALUES ('$id[1]', '$name', '$no[0]', '$no[1]');

echo 'Pet Submitted into Submissions file.';



}
}
if ( $form == 1 ) {
    echo '<br>';
    include 'form.txt';
}
else {
    include 'form.txt';
}
echo '</td>';


include 'footer.php';
 
?>

Remember that when you're using keys to specify an array item, you are using strings, not constants.

Change things like $_POST[name] to $_POST['name'].

fixed

how do i get it to show my selected option in the drop down menu if the form is not fully compleated

form code

To submit your pet to the Petting Zoo make sure its not all ready added, and then fill out this form and hit submit.<br><br>
<form method="post" action="submit.php">

<input type="hidden" name="submit" value="yes">

      Link to your Fluff Page:
    <input type="text" name="url" value="<?php if(isset($_POST['url'])) echo $_POST['url'];?>"><br>This will be something like http://apps.facebook.com/fluff/fluffbook.php?id=1109164160 .<br><br>
  Pets Name:
    <input type="text" name="name" value="<?php if(isset($_POST['name'])) echo $_POST['name'];?>"><br>
  Pet Species:  
  <select name="pet">
<option value="">Select Your Pet Species</option>
<?php
    $sortkey = '$name';

$fp = fopen('pets.txt','r');
if (!$fp) {echo 'ERROR'; exit;}

while (!feof($fp)) {
    $line = fgets($fp,2048); //use 2048 if very long lines
    $row++;
    list ($content, $name,$no) = split ('\/', $line);
    $col[$row] = array($sortkey, $name, $content, $no);
}

fclose($fp);

sort($col);
reset ($col);

$arrays = count($col) - 1;

$loop = -1;
while ($loop < $arrays) {
    $loop++;


if ($col[$loop][3] > "0") {

    echo '
<option value="'.$col[$loop][2].'">'.$col[$loop][1].'</option>';
}
}
?>
  </select>
<br>
<input type="submit" name="Submit" value="Submit" />
</form><br>
<i>Note: This will not add your pet to our database, we will add our submited (fluff)s to our database asap.</i>

Without spending a ton of time figuring out your variable names, you're going to change this line to something like "if name is selected, mark it selected"

From:
echo '
<option value="'.$col[$loop][2].'">'.$col[$loop][1].'</option>';


To:
echo '<option value="' . $col[$loop][2] . '"';
if($col[$loop][2]==$_POST['pet'])
echo ' SELECTED';
echo '>'.$col[$loop][1].'</option>';