我将所有网站文件/ rsync从一台服务器复制到另一台服务器，没有任何改变，减去了linux级别，但我得到了
PHP致命错误：在第3行的/srv/www/htdocs/includes/sidenav-products.php中调用未定义的函数n（）
不确定丢失了什么
<div class="sidenav_container">
<ul class="sidenav">
<li><a href="./products_hardware.php"<?=n('products_hardware.php')?>>
<span>Hardware</span></a></li>
<li><a href="./products_data.php"<?=n('products_data.php')?>>Data
Power</a></li>
<li><a href="./products_xblades_pblades.php"<?
=n('products_xblades_pblades.php')?>>IBM zBX xBlades<br />IBM zBX
pBlades</a></li>
<li><a href="./products_idaa.php"<?=n('products_idaa.php')?>>IDAA</a>
</li>
<li><a href="./products_pure_appliances.php"<?
=n('products_pure_appliances.php')?>>Pure Appliances</a></li>
<li><a href="./products_storage.php"<?=n('products_storage.php')?
>>Storage</a></li>
<li><a href="./products_systemz.php"<?=n('products_systemz.php')?
>>System Z</a></li>
<br />
<li><a href="./products_software.php"<?=n('products_software.php')?>>
<span>Software</span></a></li>
<li><a href="./products_app_dev.php"<?=n('products_app_dev.php')?
>>Application Development</a></li>
<li><a href="./products_bus_analytics.php"<?
=n('products_bus_analytics.php')?>>Business Analytics</a></li>
<li><a href="./products_db_systems.php"<?=n('products_db_systems.php')?
>>Database Systems</a></li>
<li><a href="./products_enterprise_cm.php"<?
=n('products_enterprise_cm.php')?>>Enterprise Content Management</a></li>
<li><a href="./products_ibm_collab.php"<?
=n('products_ibm_collab.php')?>>IBM Collaboration Solutions</a></li>
<li><a href="./products_info_management.php"<?
=n('products_info_management.php')?>>Information Management</a></li>
<li><a href="./products_network.php"<?=n('products_network.php')?
>>Network</a></li>
<li><a href="./products_rational.php"<?=n('products_rational.php')?
>>Rational</a></li>
<li><a href="./products_tivoli.php"<?=n('products_tivoli.php')?
>>Tivoli</a></li>
<li><a href="./products_trans_systems.php"<?
=n('products_trans_systems.php')?>>Transaction Systems</a></li>
<li><a href="./products_websphere.php"<?=n('products_websphere.php')?
>>Websphere</a></li>
<!--<li><a href="./products_os.php"<?=n('products_os.php')?
>>Operating Systems</a></li> -->
</ul>
</div>