PHP bind_param doesn't work in MySQli - php

Question

I have this error:
Call to a member function bind_param() on a non-object
in /home/ccraft50/public_html/C-Blog/InsertDataPosts.php on line 15
<?php
$servername2 = "localhost";
$username2 = "My DB";
$password2 = "My Pass";
$dbname2 = "My DB";
// Create connection
$dbconn2 = new mysqli($servername2, $username2, $password2, $dbname2);
// Check connection
if ($dbconn2->connect_error) {
die("Connection failed: " . $dbconn2->connect_error);
}
$insIndexData = $dbconn2->prepare("INSERT INTO " . str_replace(str_split('\\/:*?"<>|.$+-%##!~&;\',=~` '), "_", $_POST['filename']) . "_Index (SubjectName, IndexData) VALUES (?, ?)");
$str_prot_index = array('<script>', '</script>', '<?php', '?>', '<html', '</html>', '<body', '</body>', '<head', '</head>', '<pre', '</pre>', '<div', '</div>');
$insIndexData->bind_param('ss', $_POST['filename'], str_replace($str_prot_index, '', $_POST['comment']));
$insIndexData->execute();
$insIndexData->close();
if($dbconn2->prepare($insIndexData)) {
echo "Successfuly Insert data for index!";
} else {
echo "Error: " . $dbconn2->error;
}
$dbconn2->close();
?>

Answer 1

You are using a database wrong way.
A database have to consist of tables, each holding multiple rows. While you apparently want to create a distinct table for each file. Instead, you have to store all your files in a single table, adding a filename as a field, not a table name.
$stmt = $dbconn2->prepare("INSERT INTO files (SubjectName, IndexData) VALUES (?, ?)");
$stmt->bind_param('ss', $_POST['filename'], $_POST['comment']);
$stmt->execute();
echo "Successfuly Insert data for index!";
Note that the second part of code which is preparing the same query in a second time makes no sense. To test whether the insert were successful or not, you have to add this line before new mysqli(:
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
And it will throw an error if insert fails.

Answer 2

Your prepare is failing. Try to add some testing to make sure its preparing correctly. After you ->prepare
if($insIndexData !== false)
{
etc...