Supported Versions: PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8
Verifies the signature of an S/MIME signed message
openssl_pkcs7_verify( string $input_filename, int $flags, ?string $signers_certificates_filename = null, array $ca_info = [], ?string $untrusted_certificates_filename = null, ?string $content = null, ?string $output_filename = null): bool|int