On Linux (PHP5.6), this function will overwrite an existing keyfile, unless the keyfile is marked as read-only, in which case you will get an error:
error:0200100D:system library:fopen:Permission denied
(PHP 4 >= 4.2.0, PHP 5, PHP 7)
openssl_pkey_export_to_file — Gets an exportable representation of a key into a file
$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
outfilenamePath 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。
On Linux (PHP5.6), this function will overwrite an existing keyfile, unless the keyfile is marked as read-only, in which case you will get an error:
error:0200100D:system library:fopen:Permission denied
You can't use this function to export a public key
Warning: openssl_pkey_export_to_file(): supplied key param is a public key