FacetWP - convert User Email into an md5 hash

functions.php

<?php

/**
 * Add to your (child) theme's functions.php
 *
 * We've added a layout builder item (named "email-md5"), based on the "User Email" field, and set to Hidden
 * We've also added a new HTML item with the following content:
 *
 * <img src="https://www.gravatar.com/avatar/{{ email-md5 }}?s=200" />
 *
 * This generates the user's profile image (based on Gravatar)
 */
add_filter( 'facetwp_builder_item_value', function( $value, $item ) {
    if ( 'email-md5' == $item['settings']['name'] ) {
        $value = md5( $value );
    }
    return $value;
}, 10, 2 );