Add PHP Extension for GmSSL

View http://gmssl.org/docs/php-api.html for more info.

php/ext/openssl/tests/openssl_x509_export_basic.phpt

@@ -0,0 +1,45 @@
+--TEST--
+openssl_x509_export() tests
+--SKIPIF--
+<?php if (!extension_loaded("openssl")) print "skip"; ?>
+--FILE--
+<?php
+$cert_file = dirname(__FILE__) . "/cert.crt";
+
+$a = file_get_contents($cert_file);
+$b = "file://" . $cert_file;
+$c = "invalid cert";
+$d = openssl_x509_read($a);
+$e = array();
+
+var_dump(openssl_x509_export($a, $output));  // read cert as a binary string
+var_dump(openssl_x509_export($b, $output2)); // read cert from a filename string
+var_dump(openssl_x509_export($c, $output3)); // read an invalid cert, fails
+var_dump(openssl_x509_export($d, $output4)); // read cert from a resource
+var_dump(openssl_x509_export($e, $output5)); // read an array, fails
+
+if (PHP_EOL !== "\n") {
+	$a = str_replace(PHP_EOL, "\n", $a);
+}
+
+var_dump(strcmp($output, $a));
+var_dump(strcmp($output, $output2));
+var_dump(strcmp($output, $output3));
+var_dump(strcmp($output, $output4)); // different
+var_dump(strcmp($output, $output5)); // different
+?>
+--EXPECTF--
+bool(true)
+bool(true)
+
+Warning: openssl_x509_export(): cannot get cert from parameter 1 in %s on line %d
+bool(false)
+bool(true)
+
+Warning: openssl_x509_export(): cannot get cert from parameter 1 in %s on line %d
+bool(false)
+int(0)
+int(0)
+int(%d)
+int(0)
+int(%d)