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PHP Manual

Zweckprüfende 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)

Vordefinierte Konstanten
PHP Manual