Delete a Specific Post Meta For All Posts

This function will delete a specific post meta (custom field) from all posts and pages in WordPress.

See below for a tip and usage example.

PHP

function isa_delete_custom_meta( $meta_key ) {
    $args = array(
        'post_type'      => array_keys( get_post_types( array('public' => true), 'names' ) ),
        'posts_per_page' => -1,
        'post_status'    => array( 'publish', 'draft', 'future' ),
        'meta_key'       => $meta_key
   );
  
    $the_query = new WP_Query( $args );
  
    if ( $the_query->have_posts() ) {
  
        while ( $the_query->have_posts() ) {
            $the_query->the_post();
            delete_post_meta(get_the_ID(), $meta_key);
        }
  
    }
    wp_reset_postdata();
}

Tip

This code applies to all pages and post types, including custom post types. If you want to limit it to only regular posts and pages, you can change line 3 above to:

'post_type' => array('post', 'page'),

Usage

For example, to delete a post meta field that has the meta key of MY_CUSTOM_META_KEY, use this:

PHP

isa_delete_custom_meta( 'MY_CUSTOM_META_KEY' );

You must change MY_CUSTOM_META_KEY to your own meta key.

This will delete that post meta field from all posts.