diff --git a/ext/openssl/openssl_backend_common.c b/ext/openssl/openssl_backend_common.c
index 611359cccaba6..539ecf8397fcc 100644
--- a/ext/openssl/openssl_backend_common.c
+++ b/ext/openssl/openssl_backend_common.c
@@ -666,7 +666,57 @@ int openssl_x509v3_subjectAltName(BIO *bio, X509_EXTENSION *extension)
 				as = name->d.uniformResourceIdentifier;
 				BIO_write(bio, ASN1_STRING_get0_data(as),
 					ASN1_STRING_length(as));
-				break;
+				break; 
+			case GEN_DIRNAME:
+				BIO_puts(bio,"DirName:");
+
+				X509_NAME *dirn = name->d.dirn;
+				char *oneline;
+
+				if (dirn != NULL && (oneline = X509_NAME_oneline(dirn, NULL, 0)) != NULL)
+				{
+					char *comma = strchr(oneline, ',');
+					if (comma != NULL)
+					{
+						BIO_puts(bio,oneline);
+					}
+					else
+					{
+						char *p = oneline;
+						char *seg_start = oneline;
+
+						while (*p != '\0') {
+                			if (*p == ',') {
+                			    if (p > seg_start) {
+                			        size_t len = (size_t)(p - seg_start);
+                			        while (len > 0) {
+                			            int chunk = (len > INT_MAX) ? INT_MAX : (int)len;
+                			            BIO_write(bio, seg_start, chunk);
+                			            seg_start += chunk;
+                			            len      -= (size_t)chunk;
+                			        }
+                			    }
+							
+                			    BIO_write(bio, "\\,", 2);
+                			    seg_start = p + 1;
+                			}
+                			p++;
+						}
+
+						if (p > seg_start)
+						{
+							size_t len = (size_t)(p - seg_start);
+                			while (len > 0) {
+                			    int chunk = (len > INT_MAX) ? INT_MAX : (int)len;
+                			    BIO_write(bio, seg_start, chunk);
+                			    seg_start += chunk;
+                			    len      -= (size_t)chunk;
+                			}
+						}
+					}
+					OPENSSL_free(oneline);
+				}
+				break; 
 			default:
 				/* use builtin print for GEN_OTHERNAME, GEN_X400,
 				 * GEN_EDIPARTY, GEN_DIRNAME, GEN_IPADD and GEN_RID
diff --git a/ext/openssl/tests/subjectAltName.phpt b/ext/openssl/tests/subjectAltName.phpt
new file mode 100644
index 0000000000000..10b009a3ca0af
--- /dev/null
+++ b/ext/openssl/tests/subjectAltName.phpt
@@ -0,0 +1,50 @@
+--TEST--
+DirName in subjectAltName uses name-style notation with escaped commas
+--EXTENSIONS--
+openssl
+--FILE--
+<?php
+$cert = <<<'PEM'
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+PEM;
+$parsed = openssl_x509_parse($cert);
+
+if ($parsed === false || !isset($parsed['extensions']['subjectAltName'])) {
+    echo "MISSING_SUBJECT_ALT_NAME\n";
+    return;
+}
+
+$san = $parsed['extensions']['subjectAltName'];
+echo (strpos($san, 'DirName:/') !== false ? "HAS_DIRNAME_PREFIX\n" : "NO_DIRNAME_PREFIX\n");
+
+echo (strpos($san, '/O=Example Org, Inc.') !== false ? "COMMA_ESCAPED\n" : "COMMA_NOT_ESCAPED\n");
+
+?>
+--EXPECT--
+HAS_DIRNAME_PREFIX
+COMMA_ESCAPED
\ No newline at end of file