Any change in post update inlcuding metadata? - wordpress

Question

Having code below (given in a class)
class X
{
public function __construct()
{
add_action( 'post_updated', array( $this, 'datachangecheck' ), 10, 3 );
}
function datachangecheck( $post_id, $post_after, $post_before )
{
if ( $post_before->post_title != $post_after->post_title )
{
//do whatever
}
return;
}
}
Above works fine when checking if a title has been changed, but is there any away way of managing the same thing when having metadata related to it?
I only want to know if any data has changed (I don't need any returned values). I can't manage to find any hook where I can see like meta_post_before and meta_post_after or similar. Can someone point me into right direction? Thank you!

Answer 1

This was kind of tricky, so I guess someone else might have the same issue so I share some code here and hopefully someone has any help from it :-) I have the most important part in the code below:
public function __construct()
{
add_action( 'post_updated', array( $this, 'datachangecheck' ), 10, 3 );
}
/*
* datachangecheck
*
* This function is called upon hook post_updated.
* The function checks if data for updated post has been changed,
* and saves a file when data has been changed
*
* #param string $post_id id of post affected
* #param WP_Post $post_after WP_Post after post has been updated
* #param WP_Post $post_before WP_Post before post has been updated
* #return N/A
*
*/
function datachangecheck( $post_id, $post_after, $post_before )
{
//Cast postobjects into arrays, so comparision is possible with builtin-php functions
$spf = (array)$post_before;
$spa = (array)$post_after;
//These would differ every update. so remove them for possible comparision
unset ( $spf['post_modified']);
unset ( $spf['post_modified_gmt']);
unset ( $spa['post_modified']);
unset ( $spa['post_modified_gmt']);
//Check if any difference between arrays (if empty no difference)
//If not empty, save file that tells plugin that data has been changed
$ard = array_diff ( $spf, $spa);
if ( !empty ( $ard ) )
{
$this->datahaschanged_save();
}
else
{
//No change of post native data, check if any metapost data has been changed
//Remove edit_last and edit_lock because they could differ without data being changed
$this->metadata_before = get_post_meta( $post_id );
unset ( $this->metadata_before['_edit_last']);
unset ( $this->metadata_before['_edit_lock']);
add_action('updated_post_meta', array( $this, 'checkmetadata_after'), 10, 2);
}
return;
}
/*
* checkmetadata_after
*
* This function is called upon hook updated_post_meta when data has been update, but no change in native post data
* has been made and saves a file when data has been changed
*
* #param string $post_id id of post affected
* #param WP_Post $post_after WP_Post after post has been updated
* #param WP_Post $post_before WP_Post before post has been updated
* #return N/A
*
*/
function checkmetadata_after( $meta_id, $post_id )
{
//Because updated_post_meta is used, now we can grab the actual updated values
//Remove edit_last and edit_lock because they could differ without data being changed
$this->metadata_after = get_post_meta( $post_id );
unset ( $this->metadata_after['_edit_last']);
unset ( $this->metadata_after['_edit_lock']);
//Make one-level index arrays of metadata
//so array_diff works correctly down below
$arr_mdb = $this->onelevel_array( $this->metadata_before );
$arr_mda = $this->onelevel_array( $this->metadata_after );
//Compare array with metapost values before and after
//If not empty, save file that tells plugin that data has been changed
$ard_metadata = array_diff ( $arr_mdb, $arr_mda );
if (!empty ( $ard_metadata))
{
$this->datahaschanged_save();
}
return;
}