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# openssl_pkey_export_to_file

(PHP 4 >= 4.2.0, PHP 5)

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

## Description

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. 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. 成功回傳`TRUE`失敗回傳`FALSE`。

> 備注: You need to have a valid `openssl.cnf` installed for this function to operate correctly. See the notes under the installation section for more information.

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