Add Meta Post function not working

Question

I am using add post meta function to save some data and its not working

<?php
//include '../../../wp-blog-header.php';
$unique = "true";
$pageID = $_GET['postID'];
echo "pageID:";
echo $pageID;

echo "</br>";
$num_posts = $_GET['num_posts'];
echo "num_posts: ";
echo $num_posts;
echo "</br>";
$num_posts_meta_key = "num_posts";
add_post_meta($pageID, $num_posts_meta_key, $num_posts , $unique) or update_post_meta($pageID, "num_posts" , $num_posts);
?>

Can someone help me out?

Answer 1

not sure what your problem is.. are you sure you're passing the right postID parameter? does the post exist in the database?

You don't really need to do add_post_meta() or update_post_meta.

From the manual:

The first thing this function will do is make sure that $meta_key already exists on $post_id. If it does not, add_post_meta($post_id, $meta_key, $meta_value) is called instead and its result is returned.

<?php
// This minimum code should work, though you should really check that a post 
// with this id does exist.
update_post_meta($_GET['postID'], "num_posts" , $_GET['num_posts']);
?>

Answer 2

In first page I am getting all values from textboxes or checkboxes in javascript and then i am passing it in URL to next page where add_post_meta function is there.

I tried using method POST ...but then it doesnt work for me. It just submit the page and come back w/o doing anything on 1st page. I tried with GET method..but nothing works.

Hence I decided to take all values like num of post, post id in javascript and then from there pass it with url by using window.location.

I am very new to wordpress plugin coding. I thought POST method in my plugin is conflicting with some other post method in post.php..not sure though..

I am writing plugin for admin panel.