Allow members to upload their avatar using a Register Helper field during checkout or on the Member Profile Edit page.

my_pmprorh_init_user_avatar.php

<?php
/*
 * Allow members to upload their avatar using a Register Helper field during checkout or on the Member Profile Edit page.
 *
 * Requires: Paid Memberships Pro, Register Helper Add On.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

// Filter the saved or updated User Avatar meta field value and add the image to the Media Library.
function my_updated_user_avatar_user_meta( $meta_id, $user_id, $meta_key, $meta_value ) {
	// Change user_avatar to your Register Helper file upload name.
	if ( 'user_avatar' === $meta_key ) {
		$user_info	   = get_userdata( $user_id );
		$filename      = $meta_value['fullpath'];
		$filetype      = wp_check_filetype( basename( $filename ), null );
		$wp_upload_dir = wp_upload_dir();
		$attachment    = array(
			'post_mime_type' => $filetype['type'],
			'post_title'     => preg_replace( '/\.[^.]+$/', '', basename( $filename ) ),
			'post_status'    => 'inherit',
		);
		$attach_id     = wp_insert_attachment( $attachment, $filename );
		// Make sure that this file is included, as wp_generate_attachment_metadata() depends on it.
		require_once ABSPATH . 'wp-admin/includes/image.php';
		$attach_data = wp_generate_attachment_metadata( $attach_id, $filename );
		wp_update_attachment_metadata( $attach_id, $attach_data );
		update_user_meta( $user_id, 'wp_user_avatar', $attach_id );
	}
}
add_action( 'added_user_meta', 'my_updated_user_avatar_user_meta', 10, 4 );
add_action( 'updated_user_meta', 'my_updated_user_avatar_user_meta', 10, 4 );

// Filter the display of the the get_avatar function to use our local avatar.
function my_user_avatar_filter( $avatar, $id_or_email, $size, $default, $alt ) {
	$user_id = false;
	$my_user = false;
	if ( is_email( $id_or_email ) ) {
		$user_id = get_user_by( 'email', $id_or_email )->ID;
		$my_user = get_userdata( $user_id );
	} elseif ( is_numeric( $id_or_email ) ) {
		$my_user = get_userdata( $id_or_email );
	} elseif ( is_object( $id_or_email ) && isset( $id_or_email->comment_ID ) ) {
		$my_user = $id_or_email->user_id ? get_userdata( $id_or_email->user_id ) : false;
	} elseif ( is_object( $id_or_email ) ) {
		$my_user = $id_or_email;
	}

	if ( ! empty( $my_user ) ) {
		$avatar_id = get_user_meta( $my_user->ID, 'wp_user_avatar', true );
		if ( ! empty( $avatar_id ) ) {
			$avatar = wp_get_attachment_url( $avatar_id, $size );
			$avatar = "<img alt='{$alt}' src='{$avatar}' class='avatar avatar-{$size} photo' height='{$size}' width='{$size}' />";
		}
	}
	return $avatar;
}
add_filter( 'get_avatar', 'my_user_avatar_filter', 20, 5 );

// Add the User Avatar field at checkout and on the profile edit forms.
function my_pmprorh_init_user_avatar() {
	//don't break if Register Helper is not loaded
	if ( ! function_exists( 'pmprorh_add_registration_field' ) ) {
		return false;
	}
	//define the fields
	$fields   = array();
	$fields[] = new PMProRH_Field(
		'user_avatar',              // input name, will also be used as meta key
		'file',                 // type of field
		array(
			'label'     => 'Avatar',
			'hint'      => 'Recommended size is 100px X 100px',
			'profile'   => true,    // show in user profile
			'preview'   => true,    // show a preview-sized version of the image
			'addmember' => true,
			'allow_delete' => true,
		)
	);

	//add the fields into a new checkout_boxes are of the checkout page
	foreach ( $fields as $field ) {
		pmprorh_add_registration_field(
			'checkout_boxes', // location on checkout page
			$field            // PMProRH_Field object
		);
	}
}
add_action( 'init', 'my_pmprorh_init_user_avatar' );