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

The Email Validator library builds upon PHP's built in filter_var($emailAddress, FILTER_VALIDATE_EMAIL); by adding a default MX record check. It also offers additional validation against disposable email addresses, free email address providers, and a custom banned domain list.

• 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