PHP已经带来了

PHP already brings a module for interfacing GnuPG, which is fairly easy to use.

GnuPG必须已经安装在Linux服务器上，通常是在Windows机器上，我听说让PHP与GnuPG一起运行非常困难.

GnuPG must already be installed, on Linux servers it usually is, on Windows machines I heard of getting PHP running together with GnuPG rather difficult.

对于验证签名，请使用 gnupg_verify(...) ，来自链接的PHP文档的示例:

For verifying signatures, use gnupg_verify(...), example from the linked PHP documentation:

<?php
$plaintext = "";
$gpg = new gnupg();
// clearsigned
$info = $gpg -> verify($signed_text,false,$plaintext);
print_r($info);
// detached signature
$info = $gpg -> verify($signed_text,$signature);
print_r($info);
?>

在验证之前，您必须导入签名者的公钥，如果还没有完成的话.

You will have to import the signer's public key before verifying, if not done already.