If custom field value already exists today, then prevent from posting (WP)

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Basically I’m trying to prevent creating duplicate posts.

So, if today is March 13, 2021 and someone just created a post with a custom value “Apple”.

If you try again creating a post that same date with the same custom field value, it won’t let you do it.

Basically show an error message in the editor.

I need this code to be added into functions.php.

Here’s what I’ve got so far:

I know how to recognize if a custom field exists:

if ( get_post_meta( $post->ID, 'fruitoptions', true ) )

I know how to retrieve today’s date:

$args = array(
    'year' => (int) date('Y'),    
    'monthnum' => (int) date('m'),  
    'day' => (int) date('d'), 

What I can’t find is so how to prevent WordPress editor to publish the post if the above data is detected.

And basically combine everything into one code.

Any help would be appreciated.



$meta_values = get_post_meta( $post->ID, 'fruitoptions', true );
var_dump( $meta_values );
foreach($meta_values as $key=>$val){

I’m not so familiar with WordPress. Just check the var_dump. Maybe you will get the Date and e.g. Apple.

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