Update 13-php-var.conf

Author: aogg

nginx-conf.d/13-php-var.conf

@@ -5,11 +5,11 @@ set $default_php_port "9000";           # 替换为你的默认值
 
 # 如果 php_host 或 php_port 没有匹配到，则使用默认值
 set_by_lua $php_host '
-    return ngx.var.php_host == "" and ngx.var.default_php_host or ngx.var.php_host;
+    return (ngx.var.php_host or "") == "" and ngx.var.default_php_host or ngx.var.php_host;
 ';
 
 set_by_lua $php_port '
-    return ngx.var.php_port == "" and ngx.var.default_php_port or ngx.var.php_port;
+    return (ngx.var.php_port or "") == "" and ngx.var.default_php_port or ngx.var.php_port;
 ';
 
 location ~ \.php$ {