而不是处理PHP的代码它显示它作为注释

我有php代码的问题。而不是显示此代码处理它将此代码视为评论。代码的其他部分正常工作，只有这一个没有。第二个有趣的是，当我写？php而不是？网站甚至不会将此代码显示为评论。什么可能是一个原因？而不是处理PHP的代码它显示它作为注释

<? 
    if (((isset ($_GET ["leaf"])) 
    && ($_GET ["leaf"] != "news0")) 
    || (!isset ($_GET ["leaf"]))) 
     { 
     echo "<a class=\"tuco\" href=\"?node=news&amp;leaf=news0\">"; 
     } 
    else 
     { 
     echo "<strong><a class=\"tuco\" href=\"?node=news&amp;leaf=news0\">"; 
     } 
    echo "erstellen"; 
    if (((isset ($_GET ["leaf"])) 
    && ($_GET ["leaf"] != "news0")) 
    || (!isset ($_GET ["leaf"]))) 
     { 
     echo "</a>"; 
     } 
    else 
     { 
     echo "</a></strong>"; 
     } 
    echo " | "; 
    if (((isset ($_GET ["leaf"])) 
    && ($_GET ["leaf"] != "news1")) 
    || (!isset ($_GET ["leaf"]))) 
     { 
     echo "<a class=\"tuco\" href=\"?node=news&amp;leaf=news1\">"; 
     } 
    else 
     { 
     echo "<strong><a class=\"tuco\" href=\"?node=news&amp;leaf=news2\">"; 
     } 
    echo "l&#246;schen"; 
    if (((isset ($_GET ["leaf"])) 
    && ($_GET ["leaf"] != "news2")) 
    || (!isset ($_GET ["leaf"]))) 
     { 
     echo "</a>"; 
     } 
    else 
     { 
     echo "</a></strong>"; 
     }?>

Screen

来源

2014-04-07 Beacze