Coding tips
How to Add a Gemini API Key to Next.js and Vercel
Step by step: a Gemini key from Google AI Studio in .env.local, a server-only helper, a Next.js route handler, Vercel environment variables and a leak test.
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Security
Coding tips and build notes by Mahir Faysal, a student web developer in Bangladesh: tested Python, HTML, CSS, JavaScript and PHP tutorials, plus notes from my Next.js and Gemini projects. Sample posts are marked and drafts stay in the admin area.
#Beginners
#Security
#PHP
#Forms
#Next.js
#TypeScript
#CSS
#Gemini API
#HTML
#JavaScript
#Layout
#localStorage
#Python
#Zod
#Zustand
#Accessibility
#Arrays
#Async
#Canvas API
#CSS Grid
#Email
#Flexbox
#List comprehension
#MySQL
Coding tips
Simple Math Captcha in PHP With Sessions
A simple PHP math captcha in two functions: store the answer in the session, check it once with ctype_digit and ===, then add a honeypot and time check.
Coding tips
PHP Contact Form With mail(), No PHPMailer Needed
How I send contact form emails with PHP's built-in mail(): a fixed recipient, Reply-To, header injection checks, a UTF-8 subject and a fake sendmail.
Coding tips
PHP Form Validation and Sanitization Guide
How to validate and sanitize PHP form input: trim, filter_var, mb_strlen and allow-lists, then escape output with htmlspecialchars, add CSRF and redirect.
Coding tips
PHP PDO Prepared Statements for Beginners
Learn PHP PDO prepared statements with MySQL: connect safely, insert, select, update and delete, plus LIKE, IN lists, LIMIT, transactions and SQL injection.
Learning notes
How I Kept My AI API Key Off the Browser in a Quiz App
How I built Quizwright so the Gemini API key never reaches the browser: one Next.js server route, a server-only import, Zod checks and a single retry.
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