PHP Manual: 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.

Note: 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.

Parameters

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.

Return Values

Returns TRUE on success or FALSE on failure.