我正在为wordpress写一个标签过滤插件，但是由于某种原因我遇到了错误
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，仅在同一行上
if ($ _SESSION ['filter1'] == '') {
没有错误 而且仅在
['filter2'] == ''
对于所有其他值，一切正常 如果我不是跳过，而是表示1，则该错误已经出现在filter4跳转filter3上
这是整个插件代码。
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 $filter2_query_lv2;
}
}
代码已简化。
答案 0 :(得分：1)
如果这是您的简化版本，那么我不想知道原始版本的样子。不过，整个问题是，您两次定义了函数exc_post-每个过滤器定义一次，但是每次定义的方式都完全相同。一种简单的解决方案是将第一个过滤器的功能重命名为exc_post1，将另一个过滤器的功能重命名为exc_post2。
那可以，但是仍然不是一个好的解决方案，因为逻辑的主要部分重复了6次。因此，每次更改功能时，都必须更改6个位置而不是一个位置，这是一个非常糟糕的做法。
最好只定义一次过滤器函数并重用它们，因为只有文件名更改而其他所有内容都相同。
function exc_post($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);