openssl_pkey_export_to_file Gets an exportable representation of a key into a file boolopenssl_pkey_export_to_file mixedkey stringoutfilename stringpassphrase arrayconfigargs openssl_pkey_export_to_file saves an ascii-armoured (PEM encoded) rendition of key into the file named by outfilename. The key can be optionally protected by a passphrase. configargs can be used to fine-tune the export process by specifying and/or overriding options for the openssl configuration file. See openssl_csr_new for more information about configargs. &return.success; &reference.openssl.note-openssl-cnf;