emlog文章连接使用gid自增号作为文章的ID，但是由于后台有删除文章的功能，一旦删除文章那么gid自增就会出现断号。其实断号问题解决很方便，只要在添加文章的时候判断gid之前的有没有断号问题，有的话直接插入，没有的话自增。我这里的解决方法是这样的，我把gid自增段顺序读取作为值写入数组，自增段是从1开始的，但是数组键值是0开始的，那么先把数组（$gidarr[0]='0'）赋值掉，然后把$gidarr[]=gid，然后只要发现$gidarr键和键值不等就是断号了。找到我们的addlog添加文章和页面函数。路径在include/model/log_model.php。修改前: /** * 添加文章、页面 * * @param array $logData * @return int */ function addlog($logData) { $kItem = array(); $dItem = array(); foreach ($logData as $key => $data) { $kItem[] = $key; $dItem[] = $data; } $field = implode(',', $kItem); $values = "'" . implode("','", $dItem) . "'"; $this->db->query("INSERT INTO " . DB_PREFIX . "blog ($field) VALUES ($values)"); $logid = $this->db->insert_id(); return $logid; }修改后:function addlog($logData) { $kItem = array(); $dItem = array(); foreach ($logData as $key => $data) { $kItem[] = $key; $dItem[] = $data; } $field = implode(',', $kItem); $values = "'" . implode("','", $dItem) . "'"; $gidarr[0]='0'; $res = $this->db->query("SELECT gid From " . DB_PREFIX . "blog ORDER BY gid ASC"); while ($row = $this->db->fetch_array($res)) { $gidarr[] = $row['gid']; } foreach($gidarr as $key=>$val){ if($key!=$val){ $field = 'gid,'.$field; $values = "'".$key."',".$values; break; } } $this->db->query("INSERT INTO " . DB_PREFIX . "blog ($field) VALUES ($values)"); $logid = $this->db->insert_id(); return $logid; }通过改变是否需要插入语句添加gid和gid值，来自增或者插入。 假如你有多篇文章删除，添加一篇的话，只有从开始的断号，慢慢补全断号。 转自: bekeit

获取文件后缀的方法有很多种，差不多能总结出7,8种，原理基本上都分成两种。第一种：得到文件名中最后一个“.”的位置，然后再进行截取；第二种：用explode将文件名以“.”进行分割成数组，再取数组中最后一个值。具体实现源码参考：$file1 = 'e:/ddd/ww/file.doc.zip';$file2 = 'e:/ddd/ww/file.jpg.png';$suffix1 = end( explode('.', $file1) );//先把文件名以“.”分割成数组，再用end函数取数组最后一个值$suffix2 = substr( $file2, strrpos($file2, '.')+1 );//strrpos先计算出最后一个“.”的位置，再用substr截取echo $suffix1.'-'.$suffix2;

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