PHP implementation of the signature, at hand, there is a PFX file provided by BOC, signed and passed to Java to do signature verification, please God help

PHP implementation of the signature, at hand, there is a PFX file provided by BOC, signed and passed to Java to do signature verification, please God help.
The process seems to be useful to X509, PKCS7, signed the string to be passed to the Java signature verification is correct.
I have tried the method:
1, PFX file read the private key with Openssl_pkcs12_read, and then signed with Openssl_sign, the last signature of the data with

Base64_encode for encoding Conversion

2. pfx file converted to PEM, signed with Openssl_pkcs7_sign

The second way to do the signature with the correct signature length and content are known, but it is not find out where the error, so come here to help someone.

If you have done a similar signature, trouble you to point twos, or leave contact information, so that I personally contact you.

------Solution--------------------
The second method.

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