Php 为什么会出现致命错误：如果（$会话['；筛选器1'；]=='；&）则无法重新声明exc#U post（）？

我正在为wordpress编写一个标签过滤插件，但由于某些原因，我得到了一个错误

Fatal error: Cannot redeclare exc_post () (previously declared C: \ xampp \ htdocs \ wor \ wp-content \ plugins \ GOG11 \ GOG11.php: 64) in C: \ xampp \ htdocs \ wor \ wp-content \ plugins \ GOG11 \ GOG11.php on line 141

在线

 if ($ _SESSION ['filter2'] == '') {

最奇怪的是，只有在同一条线上

 if ($ _SESSION ['filter1'] == '') {

没有错误 只有在

 ['filter2'] == '' 

对于所有其他值，一切正常 如果我没有跳过，而是指示1，则错误已出现在filter4 jumping filter3上

下面是完整的插件代码

      session_start();
      if ($_POST['filter1']){   
    $_SESSION['filter1'] = $_POST['filter1'];
    }

      if ($_POST['filter2']){   
    $_SESSION['filter2'] = $_POST['filter2'];
    }

     add_shortcode ('wp-r_dop_filter','A2'); 
    function A2(){




        $R1='

<form method="POST" >
<p>Option filter</p>

<p>Filter 1</p>
level 1:  <input type="radio" name="filter1" value="1"' . ($_SESSION["filter1"] == 1 ? 'checked' : '') . '/> 
level 2:  <input type="radio" name="filter1" value="2"' . ($_SESSION["filter1"] == 2 ? 'checked' : '') . '/> 

<p>Filter 2</p>
level 1:  <input type="radio" name="filter2" value="1"' .  ($_SESSION["filter2"] == 1 ? 'checked' : '') .  '/> 
level 2:  <input type="radio" name="filter2" value="2"' .  ($_SESSION["filter2"] == 2 ? 'checked' : '') .  '/> 



<p><input type="submit" value="User"></p>
</form>
       ';

       return  $R1;
    }











if ($_SESSION['filter1'] == ''){

add_filter('pre_get_posts','exc_post'); 
function exc_post($filter1_query_lv0 ) {
    if ($filter1_query_lv0->is_category || ($filter1_query_lv0->is_home || ($filter1_query_lv0->is_feed) || ($filter1_query_lv0->is_tag)))  
    {
$filter1_way_lv0_1 = plugin_dir_url( __FILE__ );  
$filter1_way_lv0_2 = file_get_contents( $filter1_way_lv0_1 . 'filter1/level_1.txt');   
$filter1_way_lv0_3 = explode (",", $filter1_way_lv0_2);  



        $filter1_query_lv0->set('tax_query', array(  
            array(
                'taxonomy' => 'post_tag',
                'field' => 'slug',
                'terms' =>  $filter1_way_lv0_3,  
                'operator' => 'NOT IN'
            )
        ));
    }
    return $filter1_query_lv0;
}
}
else if ($_SESSION['filter1'] == 1){

add_filter('pre_get_posts','exc_post'); 
function exc_post($filter1_query_lv1) {
    if ($filter1_query_lv1->is_category || ($filter1_query_lv1->is_home || ($filter1_query_lv1->is_feed) || ($filter1_query_lv1->is_tag)))  
    {
$filter1_way_lv1_1 = plugin_dir_url( __FILE__ );  
$filter1_way_lv1_2 = file_get_contents( $filter1_way_lv1_1 . 'filter1/level_1.txt');   
$filter1_way_lv1_3 = explode (",", $filter1_way_lv1_2);  



        $filter1_query_lv1->set('tax_query', array(  
            array(
                'taxonomy' => 'post_tag',
                'field' => 'slug',
                'terms' =>  $filter1_way_lv1_3,  
                'operator' => 'NOT IN'
            )
        ));
    }
    return $filter1_query_lv1;
}

}
else if ($_SESSION['filter1'] == 2){

add_filter('pre_get_posts','exc_post'); 
function exc_post($filter1_query_lv2) {
    if ($filter1_query_lv2->is_category || ($filter1_query_lv2->is_home || ($filter1_query_lv2->is_feed) || ($filter1_query_lv2->is_tag)))  
    {
$filter1_way_lv2_1 = plugin_dir_url( __FILE__ );  
$filter1_way_lv2_2 = file_get_contents( $filter1_way_lv2_1 . 'filter1/level_2.txt');   
$filter1_way_lv2_3 = explode (",", $filter1_way_lv2_2);  



        $filter1_query_lv2->set('tax_query', array(  
            array(
                'taxonomy' => 'post_tag',
                'field' => 'slug',
                'terms' =>  $filter1_way_lv2_3,  
                'operator' => 'NOT IN'
            )
        ));
    }
    return $filter1_query_lv2;
}

}   



if ($_SESSION['filter2'] == 1){

add_filter('pre_get_posts','exc_post'); 
function exc_post($filter2_query_lv0) {
    if ($filter2_query_lv0->is_category || ($filter2_query_lv0->is_home || ($filter2_query_lv0->is_feed) || ($filter2_query_lv0->is_tag)))  
    {
$filter2_way_lv0_1 = plugin_dir_url( __FILE__ );  
$filter2_way_lv0_2 = file_get_contents( $filter2_way_lv0_1 . 'filter2/level_1.txt');   
$filter2_way_lv0_3 = explode (",", $filter2_way_lv0_2);  



        $filter2_query_lv0->set('tax_query', array(  
            array(
                'taxonomy' => 'post_tag',
                'field' => 'slug',
                'terms' =>  $filter2_way_lv0_3,  
                'operator' => 'NOT IN'
            )
        ));
    }
    return $filter2_query_lv0;
}
}
else if ($_SESSION['filter2'] == 2){

add_filter('pre_get_posts','exc_post'); 
function exc_post($filter2_query_lv1) {
    if ($filter2_query_lv1->is_category || ($filter2_query_lv1->is_home || ($filter2_query_lv1->is_feed) || ($filter2_query_lv1->is_tag)))  
    {
$filter2_way_lv1_1 = plugin_dir_url( __FILE__ );  
$filter2_way_lv1_2 = file_get_contents( $filter2_way_lv1_1 . 'filter2/level_1.txt');   
$filter2_way_lv1_3 = explode (",", $filter2_way_lv1_2);  



        $filter2_query_lv1->set('tax_query', array(  
            array(
                'taxonomy' => 'post_tag',
                'field' => 'slug',
                'terms' =>  $filter2_way_lv1_3,  
                'operator' => 'NOT IN'
            )
        ));
    }
    return $filter2_query_lv1;
}

}
else if ($_SESSION['filter2'] == ''){

add_filter('pre_get_posts','exc_post'); 
function exc_post($filter2_query_lv2) {
    if ($filter2_query_lv2->is_category || ($filter2_query_lv2->is_home || ($filter2_query_lv2->is_feed) || ($filter2_query_lv2->is_tag)))  
    {
$filter2_way_lv2_1 = plugin_dir_url( __FILE__ );  
$filter2_way_lv2_2 = file_get_contents( $filter2_way_lv2_1 . 'filter2/level_2.txt');   
$filter2_way_lv2_3 = explode (",", $filter2_way_lv2_2);  



        $filter2_query_lv2->set('tax_query', array(  
            array(
                'taxonomy' => 'post_tag',
                'field' => 'slug',
                'terms' =>  $filter2_way_lv2_3,  
                'operator' => 'NOT IN'
            )
        ));
    }
    return $filter2_query_lv2;
}

}

session_start（）；
如果（$_POST['filter1']）{
$_SESSION['filter1']=$_POST['filter1']；
}
如果（$_POST['filter2']）{
$_SESSION['filter2']=$_POST['filter2']；
}
添加_短码（'wp-r_dop_filter'，'A2'）；
函数A2（）{
$R1
选项过滤器

过滤器1

第一级：
第2级：
过滤器2

第一级：
第2级：

';
返回$R1；
}
如果（$_会话['filter1']=''）{
添加过滤器（'pre_get_posts'、'exc_post'）；
函数exc\u post（$filter1\u query\u lv0）{
if（$filter1_query_lv0->is_category | |（$filter1_query_lv0->is_home | |（$filter1_query_lv0->is_feed）|（$filter1_query_lv0->is_tag）））
{
$filter1\u way\u lv0\u 1=插件目录url（\u文件\u）；
$filter1\u-way\u-lv0\u 2=文件获取内容（$filter1\u-way\u-lv0\u-1.'filter1/level\u 1.txt'）；
$filter1\u-way\u lv0\u 3=分解（“，”，$filter1\u-way\u lv0\u 2）；
$filter1\u query\u lv0->set（'tax\u query'，数组（
排列(
“分类法”=>“后标签”，
'字段'=>'段塞'，
“术语”=>$filter1\u way\u lv0\u 3，
'运算符'=>'不在'
)
));
}
返回$filter1\u query\u lv0；
}
}
else if（$\会话['filter1']==1）{
添加过滤器（'pre_get_posts'、'exc_post'）；
函数exc\u post（$filter1\u query\u lv1）{
if（$filter1_query_lv1->is_category | |（$filter1_query_lv1->is_home | |（$filter1_query_lv1->is_feed）|（$filter1_query_lv1->is_tag）））
{
$filter1\u way\u lv1\u 1=插件目录url（\u文件\u）；
$filter1_-way_-lv1_-2=文件获取内容（$filter1_-way_-lv1_-1.'filter1/level_1.txt'）；
$filter1\u-way\u lv1\u 3=分解（“，”，$filter1\u-way\u lv1\u 2）；
$filter1\u query\u lv1->set（'tax\u query'，数组（
排列(
“分类法”=>“后标签”，
'字段'=>'段塞'，
“术语”=>$filter1\u way\u lv1\u 3，
'运算符'=>'不在'
)
));
}
返回$filter1\u query\u lv1；
}
}
else if（$\会话['filter1']==2）{
添加过滤器（'pre_get_posts'、'exc_post'）；
函数exc\u post（$filter1\u query\u lv2）{
if（$filter1_query_lv2->is_category||（$filter1_query_lv2->is_home||（$filter1_query_lv2->is_feed）|（$filter1_query_lv2->is_tag）））
{
$filter1\u way\u lv2\u 1=插件目录url（\u文件\u）；
$filter1_-way_-lv2_2=文件获取内容（$filter1_-way_-lv2_1.'filter1/level_2.txt'）；
$filter1\u-way\u lv2\u 3=分解（“，”，$filter1\u-way\u lv2\u 2）；
$filter1\u query\u lv2->set（'tax\u query'，数组（
排列(
“分类法”=>“后标签”，
'字段'=>'段塞'，
“术语”=>$filter1\u路\u 2级\u 3，
'运算符'=>'不在'
)
));
}
返回$filter1\u query\u lv2；
}
}   
如果（$_会话['filter2']==1）{
添加过滤器（'pre_get_posts'、'exc_post'）；
函数exc\u post（$filter2\u query\u lv0）{
if（$filter2_query_lv0->is_category | |（$filter2_query_lv0->is_home | |（$filter2_query_lv0->is_feed）|（$filter2_query_lv0->is_tag）））
{
$filter2\u way\u lv0\u 1=插件目录url（\u文件\u）；
$filter2_-way_-lv0_2=文件获取内容（$filter2_-way_-lv0_1.'filter2/level_1.txt'）；
$filter2\u-way\u lv0\u 3=分解（“，”，$filter2\u-way\u lv0\u 2）；
$filter2\u query\u lv0->set（'tax\u query'，数组（
排列(
“分类法”=>“后标签”，
'字段'=>'段塞'，
“术语”=>$filter2\u way\u lv0\u 3，
'运算符'=>'不在'
)
));
}
返回$filter2\u query\u lv0；
}
}
else if（$\u会话['filter2']==2）{
添加过滤器（'pre_get_posts'、'exc_post'）；
函数exc\u post（$filter2\u query\u lv1）{
if（$filter2_query_lv1->is_category | |（$filter2_query_lv1->is_home | |（$filter2_query_lv1->is_feed）|（$filter2_query_lv1->is_tag）））
{
$filter2\u way\u lv1\u 1=插件目录url（\u文件\u）；
$filter2_-way_-lv1_-2=文件获取内容（$filter2_-way_-lv1_-1.'filter2/level_-1.txt'）；
$filter2\u-way\u lv1\u 3=分解（“，”，$filter2\u-way\u lv1\u 2）；
$filter2\u query\u lv1->set（'tax\u query'，数组（
排列(
“分类法”=>“后标签”，
'字段'=>'段塞'，
“术语”=>$filter2\u way\u lv1\u 3，
'运算符'=>'不在'
)
));
}
返回$filter2\u query\u lv1；
}
}
else if（$_会话['filter2']=''）{
添加过滤器（'pre_get_posts'、'exc_post'）；
函数exc\u post（$filter2\u query\u lv2）{
if（$filter2_query_lv2->is_category | |（$filter2_query_lv2->is_home | |（$filter2_query_lv2->is_feed）|（$filter2_query_lv2->is_tag）））
{
$filter2\u way\u lv2\u 1=插件目录url（\u文件\u）；
$filter2_-way_-lv2_2=文件获取内容（$filter2_-way_-lv2_1.'filter2/level_2.txt'）；
$filter2\u-way\u lv2\u 3=分解（“，”，$filter2\u-way\u lv2\u 2）；
$filter2\u query\u lv2->set（'tax\u query'，数组（
排列(
“分类法”=>“后标签”，
'字段'=>'段塞'，
“术语”=>$filter2\u way\u 2级\u 3，
'运算符'=>'不在'
)
));
}
返回$filter2\u query\u lv2；
}
}

---

代码已经简化。

如果这是您的简化版本，我不想知道原始版本是什么样子。然而，整个问题是，您定义了函数

exc_post

两次-每个过滤器一次，但每次都完全相同。一个简单的解决方案是将第一个过滤器的函数重命名为

exc_post1

，将另一个过滤器的函数重命名为

exc_post2function exc_post($filter, $file) {
    if ($filter->is_category || ($filter->is_home || ($filter->is_feed) || ($filter->is_tag)))
    {
        $dir = plugin_dir_url( __FILE__ );
        $content = file_get_contents( $dir . $file);
        $terms = explode (",", $content);

        $filter->set('tax_query', array(
            array(
                'taxonomy' => 'post_tag',
                'field' => 'slug',
                'terms' =>  $terms,
                'operator' => 'NOT IN'
            )
        ));
    }
    return $filter;
}

if ($_SESSION['filter1'] == '') {
    $file = 'filter1/level_1.txt';
} else if ($_SESSION['filter1'] == 1) {
    $file = 'filter1/level_1.txt';
} else if ($_SESSION['filter1'] == 2) {
    $file = 'filter1/level_2.txt';
}

add_filter('pre_get_posts', function($filter) use ($file) {
    return exc_post($filter, $file);
}, 0);


if ($_SESSION['filter2'] == 1){
    $file = 'filter2/level_1.txt';
} else if ($_SESSION['filter2'] == 2){
    $file = 'filter2/level_1.txt';
} else if ($_SESSION['filter2'] == ''){
    $file = 'filter2/level_2.txt';
}

add_filter('pre_get_posts', function($filter) use ($file) {
    return exc_post($filter, $file);
}, 0);