profile-change-notice.php

<?php

// THIS WORKS FINE

function sr_user_profile_update_email( $user_id, $old_user_data ) {
	
	$user = get_userdata( $user_id );
	if($old_user_data->user_email != $user->user_email) {
		$admin_email = "chris@revelationconcept.com";
		$message = sprintf( __( 'This user has updated their profile on the SchoolRise USA Staff Member site.' ) ) . "\r\n\r\n";
		$message .= sprintf( __( 'Display Name: %s' ), $user->display_name ). "\r\n\r\n";
		$message .= sprintf( __( 'Old Email: %s' ), $old_user_data->user_email ). "\r\n\r\n";
		$message .= sprintf( __( 'New Email: %s' ), $user->user_email ). "\r\n\r\n";
		wp_mail( $admin_email, sprintf( __( '[Staff Member Site] User Profile Update' ), get_option('blogname') ), $message );
	}

}

add_action( 'profile_update', 'sr_user_profile_update_email', 10, 2 );


// THIS NOW WORKS

function sr_user_profile_update_phone( $user_id, $old_user_data ) {
  
	$old_user_data = get_transient( 'sr_old_user_data_' . $user_id );
	
	if($old_user_data->phone != $user->phone) {
		$user = get_userdata( $user_id );
		$admin_email = "chris@revelationconcept.com";
		$message = sprintf( __( 'This user has updated their profile on the SchoolRise USA Staff Member site.' ) ) . "\r\n\r\n";
		$message .= sprintf( __( 'Display Name: %s' ), $user->display_name ). "\r\n\r\n";
		$message .= sprintf( __( 'Old Phone: %s' ), $old_user_data->phone ). "\r\n\r\n";
		$message .= sprintf( __( 'New Phone: %s' ), $user->phone ). "\r\n\r\n";
		wp_mail( $admin_email, sprintf( __( '[Staff Member Site] User Profile Update' ), get_option('blogname') ), $message );
	}
  
}

add_action( 'profile_update', 'sr_user_profile_update_phone', 10, 2 );

// Save old user data and meta for later comparison
function sr_old_user_data_transient(){
	
	$user_id = get_current_user_id();
	$user_data = get_userdata( $user_id );
	$user_meta = get_user_meta( $user_id );

	foreach( $user_meta as $key=>$val ){
		$user_data->data->$key = current($val);
	}
	
	// 1 hour should be sufficient
	set_transient( 'sr_old_user_data_' . $user_id, $user_data->data, 60 * 60 );
	
}
add_action('show_user_profile', 'sr_old_user_data_transient');

// Cleanup when done
function sr_old_user_data_cleanup( $user_id, $old_user_data ){
	delete_transient( 'sr_old_user_data_' . $user_id );
}
add_action( 'profile_update', 'sr_old_user_data_cleanup', 1000, 2 );