How do I intercept Post/Page and edit before it is viewed?

Depends on what you want to do/change. You can write your own custom loop, you can pass modifying query parameters to the loop, you can filter just the content of the post.

You’d probably need to be more specific about what exactly you want to do in order to get more specific help.

I’m coding a plugin so it must be an action hook/filter much like this…

// intercept all posts and review content, do any editing to data and current values
function eci_updatethepost( $posts )
{
global $wpdb;

$allposts = array();

//loop through all the post objects
foreach( $posts as $post )
{
//var_dump($post);
//echo $post->ID.’Post ID’;

// get post meta – custom fields
$postupdated = get_post_meta($post->ID, ‘eci_lastupdate’, true);
$recordid = get_post_meta($post->ID, ‘eci_recordid’, true);
$tablename = get_post_meta($post->ID, ‘eci_tablename’, true);

// get record date from database table
$table_name = $wpdb->prefix . $tablename;// build full tablename
$query = “SELECT updated FROM " . $table_name . " WHERE postid = ". $post->ID ."“;
$recordupdated = $wpdb->get_var(‘query’);

//echo $postupdated;
//echo $recordupdated;

}

return $
}

Problem I have is that using it results in no posts on the page and I think it may be because I need to return the posts that go into this function.

Anyway thats how far I got since yesterday but still not perfect.

Thanks

I can’t do something like this, its not just the content I need to update its custom fields/meta also.

https://www.fahlstad.se/2006/08/using-wordpress-filters-a-tutorial/

Whatever I do I’ll need the post ID so I think I need the entire post object.

I done it, I think. I must be tired, I know well that if you edit an array it’s no different and can just return it, I was thinking I had to make my own array and re-build it after looking at someones example.

function eci_updatethepost( $posts )
{
global $wpdb;

//loop through all the post objects
foreach( $posts as $post )
{
// get post meta – custom fields
$postupdated = get_post_meta($post->ID, ‘eci_lastupdate’, true);
$recordid = get_post_meta($post->ID, ‘eci_recordid’, true);
$tablename = get_post_meta($post->ID, ‘eci_tablename’, true);

// get record date from database table
$table_name = $wpdb->prefix . $tablename;// build full tablename
$query = “SELECT updated FROM " . $table_name . " WHERE postid = ". $post->ID ."“;
$recordupdated = $wpdb->get_var(‘query’);
}

return $posts;
}