Php implements the signature. there is a pfx file provided by the Bank of China at hand, which is signed and passed to java for signature verification. please help me

Php implements the signature. there is a pfx file provided by the Bank of China on hand. it is signed and passed to java for signature verification. please help me. In the process, it seems useful to x509 and pkcs7. the signed string should be passed to java for signature verification. Methods I have tried: 1. read the private key in the pfx file using openssl_pkcs12_read, sign the php file with openssl_sign to implement the signature, and there is a pfx file provided by the Bank of China in hand, the signature is passed to java for signature verification. please help me.
In the process, it seems useful to x509 and pkcs7. the signed string should be passed to java for signature verification.
Methods I have tried:
1. use openssl_pkcs12_read to read the private key of the pfx file, use openssl_sign to sign the file, and use the signed data

Base64_encode for encoding conversion

2. convert the pfx file to pem and use openssl_pkcs7_sign to sign the file.

The signature made in the second method is familiar with the correct signature length and content, but there is no error found, so I am here to ask for help.

If you have signed a similar signature, please give us some advice or leave a contact information so that you can contact you privately.

------ Solution --------------------
Method 2.