(PHP 7 >= 7.2.0)
openssl_pkcs7_read — Export the PKCS7 file to an array of PEM certificates
openssl_pkcs7_read ( string $infilename , array &$certs ) : bool
This function is currently not documented; only its argument list is available.
infilename
certs
Returns true on success or false on failure.
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https://www.php.net/manual/en/function.openssl-pkcs7-read.php