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. Returns TRUE on success or FALSE on failure.
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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