Image unable to move to temporary files using move_uploaded_file (PHP)

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PHP

image

File-Upload

I am trying to store images to database which is moving the image to temporary file first then only save the image name to mysql database. I am able to upload image but some of image which size is > 2MB unable to move to temporary files. I am not sure either it is because of granting permissions to the files since I saw some forum in the internet bring up this matter when others having a problem moving files to tmp file.

What I have tried:

Here is coding that I currently use.

$imgFile = $_FILES['user_image']['name'];
$tmp_dir = $_FILES['user_image']['tmp_name'];
$imgSize = $_FILES['user_image']['size'];

$upload_dir = 'user_images/'; // upload directory

$imgExt = strtolower(pathinfo($imgFile,PATHINFO_EXTENSION)); // get image extension

// valid image extensions
$valid_extensions = array('jpeg', 'jpg', 'png', 'gif'); // valid extensions

// rename uploading image
$userpic = rand(1000,1000000).".".$imgExt;

// allow valid image file formats
if(in_array($imgExt, $valid_extensions)){           
    // Check file size '5MB'
    if($imgSize < 5000000)              {
        move_uploaded_file($tmp_dir,$upload_dir.$userpic);
    }
    else{
        $errMSG = "Sorry, your file is too large.";
    }
}
else{
    $errMSG = "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";        
}