Resource Types
Purpose checking flags
OpenSSL
PHP Manual

# Predefined Constants

## Table of Contents

- Purpose checking flags
- Padding flags
- Key types
- PKCS7 Flags/Constants
- Signature Algorithms
- Ciphers
- Version constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

Resource Types
Purpose checking flags
OpenSSL
PHP Manual