Upload image / file with PHP and store in BLOB in MySql

Good morning!

I'm trying to upload a loaded image via an input "type = file", convert the image to a BLOB and store it in my BD MySql.

However, I'm having difficulty receiving the image that was sent by $ POST.

Here is my view structure:

<form action="/upload.php" method="post" enctype="multipart/form-data">
   <div class="file-upload">
      <div class="image-upload-wrap">
         <input class="file-upload-input" type='file' name="minhaImagem" onchange="readURL(this);" accept="image/*" />
         <div class="drag-text">
            <h3>Arraste ou selecione uma imagem</h3>
         </div>
      </div>
      <div class="file-upload-content">
         <img class="file-upload-image" src="#" alt="Sua Imagem"/>
         <div class="image-title-wrap">
            <button type="button" onclick="removeUpload()" class="remove-image">Remover <span class="image-title">Imagem Selecionada</span></button>
         </div>
      </div>
   </div>
   <input type="submit" value="Salvar"/>
</form>

In the file upload.php, I tried to make a vardump on a variable that gets the result of file_get_contents, but it returns an error.

 $imgData = addslashes(file_get_contents($_FILES['minhaImagem']['tmp_name']));
 vardump($imgData);

Error : Warning: file_get_contents (): Filename can not be empty in C: \ xampp \ htdocs \ upload.php string (0)

I would like to know if there is any problem in the structure of my submit or is there any other way to do this.

EDIT:

When doing a "vardump ($ _ FILES)" in my upload.php, it returns me the image data normally:

array(1) { ["imagem"]=> array(5) { ["name"]=> string(15) "wallpaper-6.png" ["type"]=> string(9) "image/png" ["tmp_name"]=> string(23) "C:\xampp\tmp\php5A2.tmp" ["error"]=> int(0) ["size"]=> int(2961775) } }

Note: I checked in php.ini and "upload_max_filesize" is large enough for the image I want to upload.

Thank you.