Nrthugu

I have added a value to the custom user meta field. after that I was trying to delete that custom metafield to be deleted with ajax code.

<form id="um_form" method="POST">

        <p>

            <label for="um_key">

                User Meta Value:&nbsp;&nbsp;

                <input type="text" name="um_key" id="um_key" value="<?php echo get_the_id()" style="width:100%;" />

            </label>

            <input type="submit" value="Submit" />

        </p>

    </form>

Then copied all things and done from a stackoverflow

Only change made is the updating field after updating it stopped working.

Below is how I get values through wordpress queries.

get_post_meta( $post_id, "_post_like_count", true );

And the functions.php code is

function um_modifications_callback() {



    // Ensure we have the data we need to continue

    if( ! isset( $_POST ) || empty( $_POST ) || ! is_user_logged_in() ) {



        // If we don't - return custom error message and exit

        header( 'HTTP/1.1 400 Empty POST Values' );

        echo 'Could Not Verify POST Values.';

        exit;

    }



    $user_id        = get_current_user_id();                            // Get our current user ID

    $um_val         = sanitize_text_field( $_POST['first_name'] );      // Sanitize our user meta value

    $um_user_email  = sanitize_text_field( $_POST['user_email'] );      // Sanitize our user email field



    update_user_meta( $user_id, '_post_like_count', $um_val );                // Update our user meta

    wp_update_user( array(

        'ID'            => $user_id,

        'user_email'    => $um_user_email,

    ) );



    exit;

}



add_action( 'wp_ajax_nopriv_um_cb', 'um_modifications_callback' );

add_action( 'wp_ajax_um_cb', 'um_modifications_callback' );