openssl_get_privatekey Prepare a PEM formatted private key for use resourceopenssl_get_privatekey mixedkey stringpassphrase &warn.experimental.func; Returns a positive key resource identifier on success, or &false; on error. openssl_get_privatekey parses the PEM formatted private key specified by key and prepares it for use by other functions. The optional parameter passphrase must be used if the specified key is encrypted (protected by a passphrase).