'Column 'userimage' cannot be null' Error only on larger image files - php

Question

I'm having trouble with an image upload form, with most images it works just fine but with larger image files I get a Column 'userimage' cannot be null error.
I have changed the following values in my php.ini file;
post_max_size
upload_max_filesize
memory_limit
I'm using a prepared statement(I've just included a small section here);
$sql = "INSERT INTO gallery (user, area, userimage, socialurl) VALUES (?, ?, ?, ?)";
if($stmt = $conn->prepare($sql)){
$stmt->bind_param("ssss", $user, $area, $userimage, $socialurl);
I've tried searching but I can't find a similar problem.
My code, I've edited out some that isn't relevant to make the question shorter;
<?php
$error = "";
$dangererror = "";
$successmsg = "";
require("config/connect.php");
if (isset($_POST['submit'])){
if(empty($_POST['user'])) {
$error .= "User is required<br>";
}
if(empty($_POST['area'])) {
$error .= "Location is required<br>";
}
if(isset($_FILES["userimage"]) && $_FILES["userimage"]["error"] == 0){
$allowed = array("jpg" => "image/jpg", "jpeg" => "image/jpeg", "gif" => "image/gif", "png" => "image/png");
echo $_FILES["userimage"]["name"];
$userimage = $_FILES["userimage"]["name"];
echo $userimage;
$filetype = $_FILES["userimage"]["type"];
$targetDir = "uploads/";
$targetFilePath = $targetDir . $userimage;
$targetThumbFilePath = "uploads/thumbs/";
if(!file_exists("uploads/" . $_FILES["userimage"]["name"])){
// Verify file extension
$ext = pathinfo(strtolower($userimage), PATHINFO_EXTENSION);
if(array_key_exists($ext, $allowed)) {
$maxsize = 5000000;
if($_FILES['userimage']['size'] < $maxsize) {
if (move_uploaded_file($_FILES["userimage"]["tmp_name"], $targetFilePath)){
$successmsg .= "<div class='alert alert-success'>Image - " . $userimage . " - Uploaded Successfully!</div>";
$upload = 'uploads/' . $_FILES["userimage"]["name"];
list ($width, $height, $type) = getimagesize ($upload);
//switches content-type and calls the imagecreatefrom... function
<!------------- cut ------->
//switches content-type and saves thumbnail
<!------------- cut ------->
}
} else {
echo "test";
$error .= "File Exceeds 5mb Limit<br>";
}
} else {
$error .= "Invalid File Format<br>";
}
} else {
$error .= "The Filename " . $_FILES["userimage"]["name"] . " already exists - please rename your picture before uploading<br>";
}
}
if($_POST['socialpage'] != ""){
//switches content-type and saves thumbnail
<!------------- cut ------->
}
if($error) {
$dangererror = "<div class='alert alert-danger'>";
$dangererror .= $error;
$dangererror .= "</div>";
}
else {
// Prepare an insert statement
$sql = "INSERT INTO gallery (user, area, userimage, socialurl) VALUES (?, ?, ?, ?)";
if($stmt = $conn->prepare($sql)){
// Set parameters
$user = $_REQUEST['user'];
$area = $_REQUEST['area'];
// Bind variables to the prepared statement as parameters
$stmt->bind_param("ssss", $user, $area, $userimage, $socialurl);
// Attempt to execute the prepared statement
if($stmt->execute()){
$successmsg .= "<div class='alert alert-success'>Image Added Successfully!</div>";
} else{
echo "ERROR: Could not execute query: $sql. " . $conn->error;
}
} else{
echo "ERROR: Could not prepare query: $sql. " . $conn->error;
}
// Close statement
$stmt->close();
// Close connection
$conn->close();
}
}
?>

Answer 1

Your problem is that you have no else clause on this if:
if(isset($_FILES["userimage"]) && $_FILES["userimage"]["error"] == 0){
As a result, if $_FILES['userimage'] is unset, or if there is an error (i.e. $_FILES["userimage"]["error"] != 0), your $error variable remains an empty string and so you attempt to make an INSERT even though you haven't set the value of $userimage. You need to add an else clause something like this:
elseif (isset($_FILES['userimage']) {
// must have been an error uploading i.e. $_FILES["userimage"]["error"] != 0
$error .= "Error uploading file, error code = " . $_FILES["userimage"]["error"];
}
else {
// no uploaded file!
$error .= "No file uploaded!";
}

Answer 2

The problem was that when I set the following options in the php.ini file;
post_max_size
upload_max_filesize
memory_limit
I set the values too high as;
If the upload_max_filesize is larger than post_max_size, you must increase post_max_size so that it is bigger than upload_max_size.