(PHP 5 >= 5.2.0)
openssl_csr_get_public_key — Returns the public key of a CERT
本函数还未编写文档，仅有参数列表。
php at siemenroorda dot nl (2009-09-29 07:44:01)
Function openssl_pkey_get_details can read this resource. Try:
<?php
print_r(openssl_pkey_get_details(openssl_csr_get_public_key($csr)));
?>