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I have over 1000 posts. Each post has a custom field XYZ. I'm looking for a function that I can run once that will assign a value of 1 to each of the posts' custom field XYZ. I've had a look at this but i'm not getting how to put it into a one-time-run function?

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  • Do you want a free piece of code? Or you want us to help you when you show your pain? Just a bit of code.
    – Max Yudin
    Jun 18, 2017 at 15:59
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    Since I also needed this on 2021 to update things to avoid errors on wp graphql... You can also use this plugin wordpress.org/plugins/acf-quickedit-fields Activate it on each Field Group. Custom Fields / Field Group / Your Field Than go to bulk edit, and ypu'll have an option to update custom fields in there too. May 26, 2021 at 11:45

1 Answer 1

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You can run a loop through all your posts and change their meta value. To do so, create a plugin and run a loop upon its activation, using get_posts():

<?php
/*
Plugin Name: Update MetaData for Posts
Description: Enable this plugin to update the metadata for all the posts
Author: JackJohansson
Version: 1.0
Author URI: http://example.com
*/
// Run the loop when the plugin is activated
register_activation_hook(__FILE__, 'update_my_metadata');
function update_my_metadata(){
    $args = array(
        'post_type' => 'post', // Only get the posts
        'post_status' => 'publish', // Only the posts that are published
        'posts_per_page'   => -1 // Get every post
    );
    $posts = get_posts($args);
    foreach ( $posts as $post ) {
        // Run a loop and update every meta data
        update_post_meta( $post->ID, 'meta-key', 'meta_value' );
    }
}
?>

Save this code into a PHP file and upload it to your plugins directory. Once you activate the plugin, this code will run once. Then you can disable or remove it. However, leaving this plugin installed doesn't do anything, since it only runs on activation.

You no like plugins? No worries!

If you don't want to use it as a plugin, there's still a way to do it. One can simply hook into an action that runs after WordPress is loaded, and run your function then:

function update_my_metadata(){
    $args = array(
        'post_type' => 'post', // Only get the posts
        'post_status' => 'publish', // Only the posts that are published
        'posts_per_page'   => -1 // Get every post
    );
    $posts = get_posts($args);
    foreach ( $posts as $post ) {
        // Run a loop and update every meta data
        update_post_meta( $post->ID, 'meta-key', 'meta_value' );
    }
}
// Hook into init action and run our function
add_action('init','update_my_metadata');

But notice, you have to remove the code after you load WordPress once. Otherwise, it will run over and over on each load.

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