Purpose checking flags

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- PHP Manual
- Predefined Constants
- Purpose checking flags

## Purpose checking flags

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