Returns a positive key resource identifier on
success, or
FALSE
on error.
openssl_get_privatekey()
parses
key
and prepares it for use by other functions.
key
can be one of the following:
a string having the format
file://path/to/file.pem
. The named file must contain a PEM encoded
certificate/private key (it may contain both).
A PEM formatted private key.
The optional parameter
passphrase
must be used if the specified key is encrypted (protected by a
passphrase).