Email validation is a critical part of user input handling. PHP offers several methods, from simple checks to deep verification. 1. Basic Syntax Validation with filter_var() The simplest and most reliable method for basic validation is PHP's built-in filter_var() function with the FILTER_VALIDATE_EMAIL filter.
// Usage $result = validateEmail("user+tag@example.com"); if ($result['valid']) echo "Valid: " . $result['email']; validate email address php
// Length check (local part max 64, domain max 255, total max 320) if (strlen($email) > 320) return ['valid' => false, 'message' => 'Email too long']; Email validation is a critical part of user input handling
Complex email regex is notoriously error-prone. Stick with filter_var() for standard validation. 5. Advanced: Check if Email Actually Exists (SMTP Verification) For real-time existence checks (without sending email), you can attempt an SMTP handshake: Basic Syntax Validation with filter_var() The simplest and
return ['valid' => true, 'message' => 'Email is valid'];
While filter_var() is preferred, regex can be useful for custom rules: