openssl_pkey_get_private Get a private key resourceopenssl_pkey_get_private mixedkey stringpassphrase 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).