How to recover the path of an image in Database?

I have a problem recovering the path of an image in my database, the image is uploaded correctly, the route is captured well, only that the word Array comes out first, and I do not have idea because, I need you not to say that in order to use the url afterwards and show the image.

This is how it is sent to my database:

This is the code that uploads the image to the server:

subir.php

<?php

$type=$_FILES['img_up']['type'];
$tmp_name = $_FILES['img_up']["tmp_name"];
$name = $_FILES['img_up']["name"];
$nuevo_path="images/".$name;
move_uploaded_file($tmp_name,$nuevo_path);
$array=explode('.',$nuevo_path);
$ext= end($array);
echo "<h3>La imagen se subio correctamente</h3>";

?>

And in another php I recover the route:

  $imagen=$_POST.$nuevo_path;

  $insertar="INSERT INTO events VALUES('$id', '$fecha', '$ciudad', '$estado', '$info', '$costo', '$imagen')"; 

Note: omit the other variables because there is no problem in them, only with the variable $ image.

I'm not an expert, it's a school work, but I've been trying for several hours and it does not recover well, I know there are many examples on the internet but none of them help me to base myself.