if($_SERVER['REQUEST_METHOD'] == 'POST'){
  $name = $_FILES['file']['name'];
  $target_dir = "upload/";
  $target_file = $target_dir . basename($_FILES["file"]["name"]);
  // Select file type
  $imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
  // Valid file extensions
  $extensions_arr = array("jpg","jpeg","png","gif");
  // Check extension
  if( in_array($imageFileType,$extensions_arr) ){
    // Convert to base64 
    $image_base64 = base64_encode(file_get_contents($_FILES['file']['tmp_name']) );
    $image = 'data:image/'.$imageFileType.';base64,'.$image_base64;
    // Insert record
    $query = "insert into images(image) values('".$image."')";
    mysqli_query($con,$query);
    // Upload file
    move_uploaded_file($_FILES['file']['tmp_name'],$target_dir.$name);
  }
}
?>
// upload image html form 
<form method="post" action="" enctype='multipart/form-data'>
  <input type='file' name='file' />
  <input type='submit' value='Save name' name='but_upload'>
</form>

نمایش عکس ثبت شده در دیتابیس:

<?php
 $sql = "select image from images where id=1";
 $result = mysqli_query($con,$sql);
 $row = mysqli_fetch_array($result);
 $image_src2 = $row['image'];
?>
<img src='<?= $image_src; ?>' >