(PHP 4 >= 4.2.0, PHP 5, PHP 7)
openssl_x509_export_to_file — Exports a certificate to file
openssl_x509_export_to_file ( mixed $x509 , string $outfilename [, bool $notext = true ] ) : bool
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://www.php.net/manual/en/function.openssl-x509-export-to-file.php