Invalid foreach() argument

[choc_chalk]

Please help me, I've been fiddling with this codes for hours now, I can't see what's wrong with it. It always give me an invalid foreach() argument crap.

<?php
$page_title = "Edit a User";
include('includes/header.html');

echo '<h1>Edit a Post</h1>';

if((isset($_GET['id'])) && (is_numeric($_GET['id']))){
  $id = $_GET['id'];
}elseif ((isset($_POST['id'])) && (is_numeric($_POST['id']))){
  $id = $_POST['id']; 	
}else{
  echo '<p class="error">This page has been accessed in error.</p>';
  include('includes/footer.html');
  exit();
}

require_once('../mysqli_connect.php');

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

  $errors = array();

  if(empty($_POST['subject'])){
    $errors = "You forgot to enter a subject.";
  }else{
    $s = mysqli_real_escape_string($dbc, trim($_POST['subject']));
  }

  if(empty($_POST['body'])){
    $errors = "You forgot to enter a body.";
  }else{
    $b = mysqli_real_escape_string($dbc, trim($_POST['body']));
  }


  if(empty($errors)){
      $q = "UPDATE news SET subject='$s', body='$b' WHERE news_id=$id LIMIT 1";
      $r = @mysqli_query($dbc, $q);

  if(mysqli_affected_rows($dbc)==1){
    echo '<p>The post has been edited.</p>';
  }else{
    echo '<p class="error">The post could not be edited due to a system error. Please contact the webmaster.</p>';
    echo '<p>'.mysqli_error($dbc).'<br />Query: '.$q.'</p>';
  }

  $errors = array();
}else{
	echo '<p class="error">The following error(s) occurred:<br />';
	foreach($errors as $msg){
	  echo " - $msg<br />\n";
	}
	echo '</p><p>Please try again.</p>';
}
}

$q = "SELECT subject, body FROM news WHERE news_id=$id";
$r = @mysqli_query($dbc, $q);
if(mysqli_num_rows($r)==1){
  $row = mysqli_fetch_array($r, MYSQLI_NUM);
  echo '
  <form action="edit_post.php" method="POST">
	<fieldset id="npost">
		<p><input id="newpost_subject" type="text" name="subject" maxlength="60" value="'.$row[0].'" /></p>
		<p><textarea name="body" rows="10" cols="30" id="newpost_body">'.$row[1].'</textarea></p>
		<p><input type="submit" name="submit" value="Post" id="newpost_submit" /></p>
		<input type="hidden" name="submitted" value="TRUE" />
		<input type="hidden" name="id" value="'.$id.'" />
	</fieldset>
  </form>
  ';
}else{
  echo '<p class="error">This page has been accessed in error.</p>';
}

mysqli_close($dbc);

include('includes/footer.html');
?>

[NogDog]

When you assign values to $errors, use the "[]" array notation:

$errors[] = "Some message here";

Otherwise you are changing it to a scalar variable instead of an array.