Description
bool 
openssl_x509_export_to_file ( mixed x509, string outfilename [, bool notext])
     openssl_x509_export_to_file() stores
     x509 into a file named by
     outfilename in a PEM encoded format.
    
 The optional parameter notext affects
 the verbosity of the output; if it is FALSE then additional human-readable
 information is included in the output. The default value of
 notext is TRUE.
     如果成功则返回 TRUE,失败则返回 FALSE。