Make a YouTube Clone from Scratch: JavaScript PHP and MySQL

connect to the database in php by creating an includes config file, setting timezone to Europe/London, and establishing a pdo connection with try-catch error handling.

Install ffmpeg to convert videos to a supported format, generate thumbnails, and capture durations for videos. Download zip, unzip it, and place the ffmpeg packed folder in your site root.

Generate three thumbnail images from a video, store their paths in a thumbnails table linked to the video, and mark the selected thumbnail for use.

Format video durations into a readable hours:minutes:seconds string by updating the videos table with a two-parameter function (duration in seconds, video id).

Style the form header by applying 20px padding top and bottom, 0 left/right, set h3 to 24px font size with 32px line height, and reset margins and top padding.

Move the sanitize function into a form sanitiser class, save it as a PHP file, and call its static method to sanitize form input without creating an instance.

Hash passwords by applying a hashing algorithm to the user input, generating a 128-character hash. Store the hash in the password column, then rehash on login and compare.

Set the video player to 100 percent width and fix the left column at 425 pixels with a flex layout to keep the video responsive.

Create the likes and dislikes tables in phpmyadmin with an auto increment primary key, and columns for username, comment_id, and video_id, then implement queries to count likes per video.

Implement an undo like feature by deleting from likes when a user taps like again, ensuring only one of like or dislike applies.

Create and manage a subscribers table for a YouTube clone using PHP and MySQL, including id, user, and subscriber fields, plus functions to check subscriptions and count subscribers.

Style the comment section on a YouTube clone by applying flex layouts, margins, and borders to the header, profile picture, textarea, and post button.

Learn to display a newly posted comment on a YouTube clone using PHP and MySQL, building the comment block with author, profile link, and content, and debug insertion issues.

Implement a toggle reply function in JavaScript that shows or hides the comment form by locating the closest item container, computing the parent, and toggling a hidden class with CSS.

Create a like comment ajax request by adapting the like video flow, passing comment ID and video ID, and adding a new ajax PHP file.

Implement and display all comments for a video by creating a get_comments function, querying the database, looping through results, and building the output string for each comment.

Indent and style nested comment replies in the YouTube clone by left padding view replies section, and ensure replies attach under the parent with a pointer cursor and 14px font.