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.
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Forms
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.
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#Forms
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#Gemini API
#HTML
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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
HTML Form Input Types and Validation
HTML input types and built-in validation attributes (required, minlength, min, max, step, pattern) with examples tested in Chrome, plus :user-invalid styling.
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