AuthnetJSON

Library that abstracts Authorize.Net's JSON APIs. This includes the Advanced Integration Method (AIM), Automated Recurring Billing (ARB), Customer Information Manager (CIM), Transaction Reporting, Simple Integration Method (SIM), and Webhooks.

• PHP Authorize.Net JSON API Tutorial
• Authorize.Net’s Webhooks with PHP
• Github Repository

Email Validator

A robust PHP 7.4+ email validation library that extends beyond basic validation with MX record checks, disposable email detection, and free email provider validation. Features include strict typing, custom validator support, internationalization (i18n), and an extensible architecture. Perfect for applications requiring thorough email verification with customizable validation rules.

• Going Deeper Into Email Address Validation (article)
• Tutorial: PHP Email Address Validator
• Github Repository

PHP Simple Encryption

A PHP library that makes encryption and decryption of text easy.

• Tutorial: PHP Simple Encryption
• Github Repository

Password Helper

A PHP library that makes using best practices with passwords easy by default.

• Github Repository

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• @SOHotQuestions