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Problem with prepared UPDATE statement in PHP

I have a problem with a prepared UPDATE statement, everywhere, the questions viewed here, and the syntax seems correct, what am I missing?

$update_page = $db->stmt_init();
$update_page = $db->prepare ("
UPDATE pages 
SET page_title = ?, meta_description = ?, meta_keywords = ?, $content = ? 
WHERE page_uri = ?
");
$update_page->bind_param('sssss', $page_title, $meta_description, $meta_keywords, $content, $page_uri);
$update_page->execute();

It throws me

Fatal error: call of bind_param () member function for non-object

referring to line 4 (one above the last line).

@Gaurav: here is the full code - on this page there is a SELECT and UPDATE statement, SELECT works:

if (!isset($page_uri))
    {
    $page_uri = 'home'; 
    }

if (isset($_POST['update']))
    {
    $page_title = htmlspecialchars($_POST['page_title']);
    $meta_description = htmlspecialchars($_POST['meta_description']);
    $meta_keywords = htmlspecialchars($_POST['meta_keywords']);
    $content = htmlspecialchars($_POST['content']);

    $update_page = $db->stmt_init();
    $update_page->prepare ("
    UPDATE pages 
    SET page_title = ?, meta_description = ?, meta_keywords = ?, $content = ? 
    WHERE page_uri = ?
    ");

    $update_page->bind_param('sssss', $page_title, $meta_description, $meta_keywords, $content, $page_uri);
    $update_page->execute();
    }


$select_page = $db->stmt_init();
$select_page = $db->prepare ("
SELECT page_id, page_title, meta_description, meta_keywords, content, sidebar 
FROM pages 
WHERE page_uri = ? 
LIMIT 1
");
$select_page->bind_param('s', $page_uri);
$select_page->execute();
$select_page->bind_result($page_id, $page_title, $meta_description, $meta_keywords, $content, $sidebar);
$select_page->fetch();
$page_title = htmlspecialchars_decode($page_title, ENT_QUOTES);
$meta_description = htmlspecialchars_decode($meta_description, ENT_QUOTES);
$meta_keywords = htmlspecialchars_decode($meta_keywords, ENT_QUOTES);
$content = htmlspecialchars_decode($content, ENT_QUOTES);
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2 answers

SOLVED: Thank you guys for helping me. After watching, I found the answer here:

Why am I getting this function call error for a non-object when I call a function on an object?

, var_dump ($ example) bind_param(), , - - bool (false), SQL- , , ( $content ) - , , . 'm :)

+1

$update_page->prepare()

this

mysqli_stmt mysqli_stmt_prepare().

EDIT: ssssi sssss.

+2

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