Mysqli bind parameters not working - php

Question

I'm trying to use prepared statements to enter data in a database. The unprepared statement works but this prepared statement does not. I can't find out why.
Prepared version:
$stmt = $mysqli->prepare("INSERT INTO videos (file_name, upload_by, date, path)
VALUES (?, ?, ?, ?)");
$stmt->bind_param('ssss', $newstring, $id, $date->format('Y-m-d'), $location);
$stmt->execute();
Unprepared version:
$sql = "INSERT INTO videos (file_name, upload_by, date, path) VALUES ('$newstring', '$id', '
$date', 'Nominator/$location$newstring')";
mysqli_query($mysqli, $sql);

Answer 1

Replace $stmt-execute(); with $stmt->execute();
Also, don't use date and path in query. Rename them with some other name like date1 and path1.
Update your Query like below that will surely work (Tested Offline):
<?php
$mysqli = new mysqli('localhost', 'root', '', 'test2');
if ($mysqli->errno) {
printf("Connect failed: %s\n", $mysqli->error);
exit();
}
$stmt = $mysqli->prepare("INSERT INTO videos (file_name, upload_by, date1, path1) VALUES (?, ?, ?, ?)");
$stmt->bind_param('ssss', $file_name, $upload_by, $date1, $path1);
$date1 = date("Y-m-d");
$file_name = "test.jpg";
$upload_by = "amit";
$path1 = "test";
if ($result = $stmt->execute()){
echo "success";
$stmt->free_result();
} else {
echo "error";
}
$stmt->close();
?>

Answer 2

You are binding your parameter twice, if you are using only ?, don't bind parameter again just execute directly.
//Prepare your query first
$stmt = $mysqli->prepare("INSERT INTO videos (file_name, upload_by, date, path)
VALUES (?, ?, ?, ?)");
//Just pass your argument and execute directly without binding the parameter (The parameter is binded already)
$stmt->execute('ssss', $newstring, $id, $date->format('Y-m-d'), $location);