openssl_csr_sign Sign a CSR with another certificate (or itself) and generate a certificate resourceopenssl_csr_sign mixedcsr mixedcacert mixedpriv_key longdays openssl_csr_sign generates an x509 certificate resource from the csr previously generated by openssl_csr_new, but it can also be the path to a PEM encoded CSR when specified as file://path/to/csr or an exported string generated by openssl_csr_export. The generated certificate will be signed by cacert. If cacert is &null;, the generated certificate will be a self-signed certificate. priv_key is the private key that corresponds to cacert. days specifies the length of time for which the generated certificate will be valid, in days. Returns an x509 certificate resource on success, &false; on failure. &reference.openssl.note-openssl-cnf;