解决更换PHP5.4以上版本后Dedecms后台登录空白问题的方法
<p>把PHP的版本从5.2.14升到了5.4.15，升级完后dedecms后台却打开空白，检查了各种权限和文件，都没有问题，找来找去，原来是PHP版本函数的问题，它是用session_register来注册一个session变量，但是在php5.4以上中已经移除了这个功能<br><span><strong>解决办法：</strong></span><br>
找到include/userlogin.class.php，里面有一个keepuser()函数，它是用session_register来注册一个session变量，但是在php5.4中已经移除了这个功能，见官网介绍：</p>
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<img style="max-width:100%!important;height:auto!important;"title="解决更换PHP5.4以上版本后Dedecms后台登录空白问题的方法" alt="解决更换PHP5.4以上版本后Dedecms后台登录空白问题的方法" id="theimg" onclick="window.open(this.src)" src="https://zhuji.jb51.net/uploads/img/202305/2cb8e22a35752d7f226dd07752cb1585.jpg"></p>
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如果使用的该php版本肯定会出错的，不过我们可以修改下代码：<br>
把@session_register($this->keepUserIDTag); 注释掉，然后改为<br><span><strong>if (!isset($_SESSION[$this->keepUserIDTag])) </strong></span><br>
一共有六个，全部改为下面这样：</p>
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<code class="php keyword">if</code> <code class="php plain">(!isset(</code><code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$this</code><code class="php plain">->keepUserIDTag])) </code>
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<code class="php comments">//@session_register($this->keepUserIDTag); </code>
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<code class="php spaces"> </code>
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<code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$this</code><code class="php plain">->keepUserIDTag] = </code><code class="php variable">$this</code><code class="php plain">->userID; </code>
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<code class="php spaces"> </code>
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<code class="php keyword">if</code> <code class="php plain">(!isset(</code><code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$this</code><code class="php plain">->keepUserTypeTag])) </code>
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<code class="php comments">//@session_register($this->keepUserTypeTag); </code>
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<code class="php spaces"> </code>
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<code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$this</code><code class="php plain">->keepUserTypeTag] = </code><code class="php variable">$this</code><code class="php plain">->userType; </code>
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<code class="php spaces"> </code>
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<code class="php keyword">if</code> <code class="php plain">(!isset(</code><code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$this</code><code class="php plain">->keepUserChannelTag])) </code>
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<code class="php comments">//@session_register($this->keepUserChannelTag); </code>
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<code class="php spaces"> </code>
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<code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$this</code><code class="php plain">->keepUserChannelTag] = </code><code class="php variable">$this</code><code class="php plain">->userChannel; </code>
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<code class="php spaces"> </code>
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<code class="php keyword">if</code> <code class="php plain">(!isset(</code><code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$this</code><code class="php plain">->keepUserNameTag])) </code>
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<code class="php comments">//@session_register($this->keepUserNameTag); </code>
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<code class="php spaces"> </code>
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<code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$this</code><code class="php plain">->keepUserNameTag] = </code><code class="php variable">$this</code><code class="php plain">->userName; </code>
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<code class="php spaces"> </code>
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<code class="php keyword">if</code> <code class="php plain">(!isset(</code><code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$this</code><code class="php plain">->keepUserPurviewTag])) </code>
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<code class="php comments">//@session_register($this->keepUserPurviewTag); </code>
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<code class="php spaces"> </code>
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<code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$this</code><code class="php plain">->keepUserPurviewTag] = </code><code class="php variable">$this</code><code class="php plain">->userPurview; </code>
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<code class="php spaces"> </code>
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<code class="php keyword">if</code> <code class="php plain">(!isset(</code><code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$this</code><code class="php plain">->keepAdminStyleTag])) </code>
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<code class="php comments">//@session_register($this->keepAdminStyleTag); </code>
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<code class="php spaces"> </code>
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<code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$this</code><code class="php plain">->keepAdminStyleTag] = </code><code class="php variable">$adminstyle</code><code class="php plain">; </code>
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<p>
重新进入后台登录，就可以正常跳转到管理页面了。<br>
因为对PHP并不熟，网上一般都说是data/common.inc.php文件编码的问题，把编码要改为无BOM格式文件保存，居然没有说是php5.4版本的问题<br><span><strong>另外一种方法：</strong></span><br>
在include/helpers/util.helper.php末尾加入以下代码</p>
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<code class="php keyword">function</code> <code class="php plain">fix_session_register(){ </code>
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<code class="php spaces"> </code><code class="php keyword">function</code> <code class="php plain">session_register(){ </code>
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<code class="php spaces"> </code><code class="php variable">$args</code> <code class="php plain">= func_get_args(); </code>
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<code class="php spaces"> </code><code class="php keyword">foreach</code> <code class="php plain">(</code><code class="php variable">$args</code> <code class="php keyword">as</code> <code class="php variable">$key</code><code class="php plain">){ </code>
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<code class="php spaces"> </code><code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$key</code><code class="php plain">]=</code><code class="php variable">$GLOBALS</code><code class="php plain">[</code><code class="php variable">$key</code><code class="php plain">]; </code>
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<code class="php spaces"> </code><code class="php plain">} </code>
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<code class="php spaces"> </code><code class="php plain">} </code>
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<code class="php spaces"> </code><code class="php keyword">function</code> <code class="php plain">session_is_registered(</code><code class="php variable">$key</code><code class="php plain">){ </code>
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<code class="php spaces"> </code><code class="php keyword">return</code> <code class="php plain">isset(</code><code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$key</code><code class="php plain">]); </code>
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<code class="php spaces"> </code><code class="php plain">} </code>
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<code class="php spaces"> </code><code class="php keyword">function</code> <code class="php plain">session_unregister(</code><code class="php variable">$key</code><code class="php plain">){ </code>
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<code class="php spaces"> </code><code class="php plain">unset(</code><code class="php variable">$_SESSION</code><code class="php plain">[</code><code class="php variable">$key</code><code class="php plain">]); </code>
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<code class="php spaces"> </code><code class="php plain">} </code>
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<code class="php plain">} </code>
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<code class="php keyword">if</code> <code class="php plain">(!function_exists(</code><code class="php string">'session_register'</code><code class="php plain">)) fix_session_register(); </code>
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<p>
这样php5.4下dedecms就能正常使用了，希望本文分享的两种方法都可以帮助大家顺利解决问题。</p>
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