Predefined Constants
Padding flags for asymmetric encryption
Predefined Constants
PHP Manual

## Purpose checking flags

`X509_PURPOSE_SSL_CLIENT` (integer)
`X509_PURPOSE_SSL_SERVER` (integer)
`X509_PURPOSE_NS_SSL_SERVER` (integer)
`X509_PURPOSE_SMIME_SIGN` (integer)
`X509_PURPOSE_SMIME_ENCRYPT` (integer)
`X509_PURPOSE_CRL_SIGN` (integer)
`X509_PURPOSE_ANY` (integer)

Predefined Constants
Padding flags for asymmetric encryption
Predefined Constants
PHP Manual