openssl_x509_export_to_file

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

openssl_x509_export_to_file — Exports a certificate to file

bool openssl_x509_export_to_file ( mixed $x509 , string $outfilename [, bool $notext = TRUE ] )

openssl_x509_export_to_file() stores x509 into a file named by outfilename in a PEM encoded format.

x509: See Key/Certificate parameters for a list of valid values.
outfilename: Path to the output file.
notext: The optional parameter notext affects the verbosity of the output; if it is FALSE, then additional human-readable information is included in the output. The default value of notext is TRUE.

Returns TRUE on success or FALSE on failure.

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https://secure.php.net/manual/en/function.openssl-x509-export-to-file.php