PHPCMS的文本缓存实现
CODE:
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<?php
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defined('IN_PHPCMS') or exit('Access Denied');
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/**
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这个文件里面全是有关生成文本缓存的函数。文本缓存是个好东西。一般的项目,我们用不着内存缓存 : memcached ,文本搞定。
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原理是这样的: 我们在后台是不是可以设置很多有关网站的参数。而这些参数很多都是固定的。就不变化的。都存到咱的数据库上。而我们程序那里呢
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每次都要访问数据库读出参数来进行我们程序中的操作。首先数据库查询是个很耗硬盘IO资源的一个东西,所以文本缓存刚好能减轻数据库那边的承重。
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我们在程序开始就把数据库里面的配置都转化为数组 等 放到 php文件里面。这样我们可以直接访问php文件而不用每次都访问数据库了。 php文本缓存其实成了
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我们程序和数据库的一个中间件。 所以我们自己写自己的文本缓存的时候其实要实现的很简单: 读数据库 -> 写到PHP文件 -> 程序中include
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来吧。开始文本缓存学习
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*/
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function cache_all() //生成所有缓存的总操作函数
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{
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cache_table(); //生成所有的数据库表名,表名是根据数据库里面当前的表明而生成。请看这个函数的详细分析
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require_once PHPCMS_CACHEDIR.'table.php'; //包含表常量
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cache_common();
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cache_member_group();
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$modules = cache_module();
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$channelids = cache_channel(0);
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$keyids = array_merge($modules, $channelids);
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foreach($keyids as $keyid)
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{
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$catids = cache_categorys($keyid);
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if(is_array($catids))
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{
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foreach($catids as $catid)
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{
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cache_category($catid);
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}
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}
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}
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cache_type(0);
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return TRUE;
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}
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function cache_common()
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{
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global $db;
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$query = $db->query("SELECT module,name,iscore,iscopy,isshare,moduledir,moduledomain FROM ".TABLE_MODULE." WHERE disabled=0"); //查询所有能用的模块
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while($r = $db->fetch_array($query))
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{
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$r['linkurl'] = '';
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if($r['module'] != 'phpcms' && $r['iscopy'] == 0) $r['linkurl'] = linkurl($r['moduledomain'] ? dir_path($r['moduledomain']) : $r['moduledir'].'/');
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//如果模块存在目录的就取它目录地址
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unset($r['moduledomain']);
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$key = $r['module'];
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$data[$key] = $r;
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}
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$CACHE['module'] = $data; //存到缓存数组,等一下一起把 $CACHE 数组写到文本里去
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$data = array();
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$query = $db->query("SELECT channelid,module,channelname,channeldir,channeldomain,channelpic,introduce,
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style,islink,linkurl,cat_html_urlruleid,item_html_urlruleid,special_html_urlruleid,
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cat_php_urlruleid,item_php_urlruleid,special_php_urlruleid FROM ".TABLE_CHANNEL." WHERE disabled=0 ORDER by listorder"); //罗列能用的频道列表
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while($r = $db->fetch_array($query))
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{
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$r['linkurl'] = linkurl($r['linkurl']);
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$key = $r['channelid'];
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$data[$key] = $r;
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}
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$CACHE['channel'] = $data; //存到缓存数组
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$data = array();
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$r = $db->get_one("SELECT setting FROM ".TABLE_MODULE." WHERE module='phpcms'");
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$CACHE['phpcms'] = unserialize($r['setting']);
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//查询 phpcms这个模块的设置信息,大家可以看下数据库这个表内容。setting 字段里面的信息是经过serialize 函数窜行化的。
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//所以取出的内容要unserialize 反窜行.我是挺喜欢使用serialize 函数的。他可以实现把一个数组存到数据库或把一个对象存到数据库。或是拿来GET传递都行。
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//太强了。大家可以试用下。可能你项目某个地方需要用到哦。
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$fields = array();
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$result = $db->query("SELECT * FROM ".TABLE_FIELD." ORDER BY fieldid"); //下栽模块的信息,请自己看下这个表的数据就明白
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while($r = $db->fetch_array($result))
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{
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$tablename = $r['tablename'];
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$fields[$tablename] .= ','.$r['name'];
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}
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$CACHE['field'] = $fields;
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cache_write('common.php', $CACHE); //开始把$CACHE 数组写到 common.php 这个文本缓存里。大家可以自己去打开这个文件看下内容。一切了然
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return $CACHE;
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}
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function cache_update($action='')//更新文本缓存。最好在后台操作使用。因为PHP的文件flock 文件锁在某些平台使用不是很好。会出现多用户同写一个文件从而破坏缓存文件
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{
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global $db;
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$data=array();
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switch($action)
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{
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case 'keylink';
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$query=$db->query("SELECT linktext,linkurl FROM ".TABLE_KEYLINK." where passed=1");
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while($r=$db->fetch_array($query)){
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$data[]=$r;
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}
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break;
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case 'reword';
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$query = $db->query("SELECT word,replacement FROM ".TABLE_REWORD." where passed=1");
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while($r = $db->fetch_array($query))
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{
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$data[]=$r;
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}
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break;
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default:
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$actions = array('keylink','reword');
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array_map('cache_update', $actions);
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return TRUE;
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}
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cache_write('cache_'.$action.'.php', $data);
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return $data;
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}
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function cache_table()
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{
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global $db,$CONFIG;
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$query = $db->query("SHOW TABLES FROM `".$CONFIG['dbname']."`");
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/**
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显示数据库里面的所有表名
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*/
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while($r = $db->fetch_row($query))
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{
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$table = $r[0];
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if(preg_match("/^".$CONFIG['tablepre']."/i", $table)) //寻找表前缀等于 $CONFIG['tablepre'] (在config.inc.php里设置) @@表前缀还有这个作用 嘿嘿
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{
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$tablename = str_replace($CONFIG['tablepre'], 'table_', $table);
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$data[$tablename] = $table; // $data['table_xx'] = xx; 形式 只能意会下了
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}
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}
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$db->free_result($query); //$db->free_result() 这个类方法其实是掉用了函数:mysql_free_result() 函数 主要是为了清除数据库大的查询而占用的内存。还是有必要的哦
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if(!is_dir(PHPCMS_CACHEDIR)) // 常量 PHPCMS_CACHEDIR 在 common.inc.php 里面定义的。大家不记得了去看看吧。是存放phpcms 缓存目录的路径,这里意思是:如果缓存目录不存在
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{
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dir_create(PHPCMS_CACHEDIR); //如果缓存目录不存在那么就创建
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dir_create($CONFIG['templatescachedir']); //创建编译后的PHP模板目录,有关phpcms模板引擎编写。在下一章合适就开讲
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/**
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dir_create() 函数为创建 目录函数。PHPCMS自己封装的,刚看了下。phpcms 挺强。这个函数还可以通过ftp 来创建目录。这样就可以解决一些 开启了安全模式下的服务器对于创建目录等出现的问题
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因为涉及到PHP FTP 知识。所以打算讲解到下面再说。
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*/
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}
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cache_write('table.php', $data , 'constant'); //很多朋友说找不到phpcms 表常量在那里定义的。就是在这里。
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/**
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cache_write() 函数在global.func.php里面定义的。是把 已经从数据库取出来的数组信息写到 PHP文本上去。@@文本缓存关键的一步 废话少说上菜:
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function cache_write($file, $string, $type = 'array')
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{
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if(is_array($string)) //检测 $string 内容是字符窜的呢还是数组的,是数组的那就继续 ..
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{
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$type = strtolower($type);
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if($type == 'array')//然后再判断这个函数的模式标致 ,是否为数组模式,默认为数组模式
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{
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$string = "<?php"n return ".var_export($string,TRUE).";"n?>";
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//这个太关键了。因为我们把数据库的信息写到文本上去的时候。是以符合PHP语法的格式写进去的。为什么呢?@@ 十分废话,因为如果不是以PHP格式写到文件里面去
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那么这个PHP文件怎么能给我们include 进程序运行调用呢? 呵呵。 知道这一点就真的明白文本缓存的实现了。忒简单。 这里使用了个小技巧:使用了 var_export() 函数
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这个函数会返回一个变量的字符窜形式。这个函数太有帮助了。如果没有这个函数,我们还要自己想办法实现呢。自己写一次文本缓存就明白了。会碰到这个问题的。 '"n' 这个是
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文本文件的换行。初学者 别把<br> 和 '"n' 搞混罗。 一个是html 的 一个是文本文件的
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}
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elseif($type == 'constant') //以内容形式
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{
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$data='';
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foreach($string as $key => $value) $data .= "define('".strtoupper($key)."','".addslashes($value)."');"n";
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$string = "<?php"n".$data.""n?>";
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如果以内容形式的话。就不是写数组到文本里面了。而是把内容都定义成常量。
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}
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}
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$strlen = file_put_contents(PHPCMS_CACHEDIR.$file, $string);//file_put_contents()函数 是PHP5才支持的 效率最好。建议使用
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chmod(PHPCMS_CACHEDIR.$file, 0777); 设置目录 为可读可写可执行
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return $strlen; //返回写到文本的字节数
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}
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再说多一个读 缓存文件的操作函数 :上菜
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function cache_read($file, $mode = 'i')
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{
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$cachefile = PHPCMS_CACHEDIR.$file;
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if(!file_exists($cachefile)) return array();
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return $mode == 'i' ? include $cachefile : file_get_contents($cachefile);
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}
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读缓存其实就是 include php缓存文件。 讲完走人
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*/
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return $data;
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}
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/**
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phpcms 的所有数据库表名 都用根据数据库当前的表名来用常量来进行定义。我认为这样设计不是很好。不够灵活:比如如果我们更改数据库的一个表名的话。
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那么会出现找不到表的错误信息。而且想要修复还很麻烦。就是说不能随便更改表名了。不推荐大家这样写。我们可以把表名都定义在一个PHP文件里面。这样我们以后
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要改某个表名,就很方便了。
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*/
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