How to upload photos/file to server using php?

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<form action="upload.php" method="post" enctype="multipart/form-data">
   Select file to upload:
   <input type="file" name="fileToUpload" id="fileToUpload">
   <input type="submit" value="Upload File" name="submit">
</form>

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<?php

$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));

// Check if file is an actual file or fake file
if(isset($_POST["submit"])) {
   $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
   if($check !== false) {
      echo "File is an image - " . $check["mime"] . ".";
      $uploadOk = 1;
   } else {
      echo "File is not an image.";
      $uploadOk = 0;
   }
}

// Check if file already exists
if (file_exists($target_file)) {
   echo "Sorry, file already exists.";
   $uploadOk = 0;
}

// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
   echo "Sorry, your file is too large.";
   $uploadOk = 0;
}

if ($uploadOk == 0) {
   echo "Sorry, your file was not uploaded.";

} else {
   if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
      echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
   } else {
      echo "Sorry, there was an error uploading your file.";
   }
}
?>