Simple Comment Editing - Logged In Users Only

sce-logged-in-only.php

<?php
//Requires PHP >= 5.3
add_filter( 'sce_can_edit', function( $can_edit, $comment_obj, $comment_id, $post_id ) {
	//Make sure user is logged in
	if ( !is_user_logged_in() ) {
		return false;	
	}
	
	//Get current user id
	$user = wp_get_current_user();
	$user_id = $user->ID;
	
	//Check if comment author is same as current user
	if ( (int)$comment_obj->user_id === $user_id ) {
		return true;	
	}
	return false;
}, 10, 4 );
?>