Question : code echoing instead of data

hello
i have been using this code for some time but today it started to display the code to the screen instead of the results. could someone check my code and see what is happening. i have checked but cannot see why it is doing this. i have included screenshot of problem. many thanks

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code that is echoing to screen filesadd.php
============================================

$array = split('[,]', $_POST['fileno']);

if (isset($_POST['submit'])) {
foreach ($array as $fileno) {
 if ($fileno == '' && $box == ''){
echo '<div style="background-color:#ffa; padding:2px; color:#ff0000;font-size:12px;font-weight:normal">' . 'You must select a box & include a file' . '</div>';
}elseif ($fileno == ''){
echo '<div style="background-color:#ffa; padding:2px; color:#ff0000;font-size:12px;font-weight:normal">' . 'You must enter a file reference' . '</div>';
}elseif ($box == ""){
//echo error
echo '<div style="background-color:#ffa; padding:2px; color:#ff0000;font-size:12px;font-weight:normal">' . 'You must select a box' . '</div>';
}else{
$sql = "SELECT custref FROM files WHERE custref = '$fileno' ";
$result = runSQL($sql) or die(mysql_error());
if (mysql_num_rows($result)>0){
 echo '<div style="background-color:#ffa; padding:2px; color:#ff0000;font-size:12px;font-weight:normal">' . $fileno . '  is already in the database. No duplicates' . '</div>';
}else{
 //insert into db;
echo '<div style="background-color:#ffa; padding:2px; color:#33CC33;font-size:12px;font-weight:normal">' . $fileno . "Box: " . $box . $authorised . 'Successfull' . '</div>';
$sql = "INSERT INTO `files` (customer, authorisation, boxstatus, boxref, custref, filestatus) VALUES ('$customer', '$authorised', '$boxstatus', '$box', '$fileno', $filestatus)";
$result = runSQL($sql) or die(mysql_error());
//echo 'This record is valid';
//header("Location: http://localhost/sample/admin/files/index.php");
 //exit();




    }
  }
}
}

Attachments:

success-code.png (37 KB) (File Type Details)

code error

Question : code echoing instead of data

Answer : code echoing instead of data

It probably dropped out of PHP somewhere? Do you have short_open_tags enabled?