openssl_x509_checkpurpose(PHP 4 >= 4.0.6) openssl_x509_checkpurpose -- Verifies if a certificate can be used for a particular purposeDescriptionbool openssl_x509_checkpurpose ( mixed x509cert, int purpose, array cainfo [, string untrustedfile])Returns TRUE if the certificate can be used for the intended purpose, FALSE if it cannot, or -1 on error. openssl_x509_checkpurpose() examines the certificate specified by x509cert to see if it can be used for the purpose specified by purpose. cainfo should be an array of trusted CA files/dirs as described in Certificate Verification. untrustedfile, if specified, is the name of a PEM encoded file holding certificates that can be used to help verify the certificate, although no trust in placed in the certificates that come from that file.
表格 1. openssl_x509_checkpurpose() purposes
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