openssl_pkcs7_verify

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