openssl_pkey_export_to_file

(PHP 4 >= 4.2.0, PHP 5, PHP 7)

openssl_pkey_export_to_file — Gets an exportable representation of a key into a file

bool openssl_pkey_export_to_file ( mixed $key , string $outfilename [, string $passphrase [, array $configargs ]] )

openssl_pkey_export_to_file() saves an ascii-armoured (PEM encoded) rendition of key into the file named by outfilename.

Note: 必须安装有效的 openssl.cnf 以保证此函数正确运行。参考有关安装的说明以获得更多信息。

key
outfilename: Path to the output file.
passphrase: The key can be optionally protected by a passphrase.
configargs: 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.

成功时返回 TRUE，或者在失败时返回 FALSE。