Description
array 
openssl_x509_parse ( mixed x509cert [, bool shortnames])
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    openssl_x509_parse() returns information about the
    supplied x509cert, including fields such as subject
    name, issuer name, purposes, valid from and valid to dates etc.
    shortnames controls how the data is indexed in the
    array - if shortnames is TRUE (the default) then
    fields will be indexed with the short name form, otherwise, the long name
    form will be used - e.g.: CN is the shortname form of commonName.
   
The structure of the returned data is (deliberately) not
   yet documented, as it is still subject to change.