2016年，我为一个客户端创建了简单的自定义WordPress插件，它只显示从自定义表查询的结果的分页列表。

try {

    $recordcountquery = \'SELECT
            FName,LName
        FROM
            tblBurialRegister WHERE\';
    
    if (!empty($_SESSION[\'firstname\']))
    {
        $cond = $mydb->prepare(\' FName = %s\', $_SESSION[\'firstname\']);
        $recordcountquery .= $cond; 
    }
    if (!empty($_SESSION[\'lastname\']) && !empty($_SESSION[\'firstname\'])) 
    {
        $recordcountquery .= \' and\';
    }
    if (!empty($_SESSION[\'lastname\']))
    {
        $cond = $mydb->prepare(\' LName = %s\', $_SESSION[\'lastname\']);
        $recordcountquery .= $cond;
    }
    $countresults = $mydb->get_results($recordcountquery);
    $total = count($countresults);

// How many items to list per page
    $limit = 20;

    // How many pages will there be
    $pages = ceil($total / $limit); 
    // What page are we currently on?
    $page = get_query_var(\'page\');
    
    if($page == 0)
    {
    $page = 1;
    }   
    
    // Calculate the offset for the query
    $offset = ($page - 1)  * $limit;
        // Some information to display to the user
    $start = $offset + 1;
    $end = min(($offset + $limit), $total);

    // The "back" link
    $prevlink = ($page > 1) ? \'<a href="?page=1" title="First page">&laquo;</a> <a href="?page=\' . ($page - 1) . \'" title="Previous page">&lsaquo;</a>\' : \'<span class="disabled">&laquo;</span> <span class="disabled">&lsaquo;</span>\';

    // The "forward" link
    $nextlink = ($page < $pages) ? \'<a href="?page=\' . ($page + 1) . \'" title="Next page">&rsaquo;</a> <a href="?page=\' . $pages . \'" title="Last page">&raquo;</a>\' : \'<span class="disabled">&rsaquo;</span> <span class="disabled">&raquo;</span>\';
    

if (count($countresults) > 0)
    {
echo "<span id=\'results\' class=\'top-offset\'></span><p style=\'font-size:x-large;\'>Showing results for: ".$_SESSION[\'firstname\']." ".$_SESSION[\'lastname\']."</p><br/>";

    // Display the paging information
    echo \'<div id="paging" class="paging-text" style="font-size: large;"><p>\', $prevlink, \' Page \', $page, \' of \', $pages, \' pages, displaying \', $start, \'-\', $end, \' of \', $total, \' results \', $nextlink, \' </p></div>\';
    }
    
    $query = \'SELECT
            ID,NUM,FName,LName,AGE,DATEBORN,DDate
        FROM
            tblBurialRegister WHERE\';
    
    if (!empty($_SESSION[\'firstname\']))
    {
        $cond = $mydb->prepare(\' FName = %s\', $_SESSION[\'firstname\']);
        $query .= $cond;    
    }
    if (!empty($_SESSION[\'lastname\']) && !empty($_SESSION[\'firstname\'])) 
    {
        $query .= \' and\';
    }
    if (!empty($_SESSION[\'lastname\']))
    {
        $cond = $mydb->prepare(\' LName = %s\', $_SESSION[\'lastname\']);
        $query .= $cond;
    }
    
    $query .= \' ORDER BY
            LName,FName
        LIMIT \'
            . $limit .
        \' OFFSET \'
            . $offset .\'\';
    
    $results = $mydb->get_results($query);
    
    
    
    // Do we have any results?
    if (count($results) > 0) {
        echo "<div style=\'overflow-x:auto;\'><table style=\'font-size:large;\'><th>First Name</th><th>Last Name</th><th>AGE</th><th></th>";
        foreach ($results as $obj) :
        
        $age = $obj->AGE;
        if(empty($age))
        {
            $age = \'Unknown\';
        }
        $bdate = $obj->DATEBORN;
        if(empty($bdate))
        {
            $bdate = \'Unknown\';
        }
        $ddate = $obj->DDate;
        if(empty($ddate))
        {
            $ddate = \'Unknown\';
        }
        
        echo "<tr><td>".$obj->FName."</td><td>".$obj->LName."</td><td>".$age."</td><td><form method=\'post\' action=\'http://www.website.com/record-search-details/\'><button id=\'myBtn\' class=\'et_pb_contact_submit et_pb_button rsButton\' style=\'color: #424892!important;
    border-color: #424892;\' type=\'submit\' name=\'RecordDetails\' value=".$obj->ID.">Details</button></form></td></tr>";
    endforeach;
    echo "</table></div>";
    } else {
        echo \'<p>No results found.</p>\';
    }

} catch (Exception $e) {
    echo \'<p>\', $e->getMessage(), \'</p>\';
}

此代码自发布以来未被触及，并且一直在运行。在过去的几个月里，他们向我报告分页不起作用，用户无法通过第一页。

在我看来，当单击分页中的链接时，查询字符串正在被删除。?page=2. 也许WordPress更新中的某些更改改变了查询字符串的行为？

我调查了一下wp_removable_query_args() 在里面functions.php 插件中存在如下内容：

function wp_removable_query_args() {
    $removable_query_args = array(
        \'activate\',
        \'activated\',
        \'admin_email_remind_later\',
        \'approved\',
        \'core-major-auto-updates-saved\',
        \'deactivate\',
        \'delete_count\',
        \'deleted\',
        \'disabled\',
        \'doing_wp_cron\',
        \'enabled\',
        \'error\',
        \'hotkeys_highlight_first\',
        \'hotkeys_highlight_last\',
        \'ids\',
        \'locked\',
        \'message\',
        \'same\',
        \'saved\',
        \'settings-updated\',
        \'skipped\',
        \'spammed\',
        \'trashed\',
        \'unspammed\',
        \'untrashed\',
        \'update\',
        \'updated\',
        \'wp-post-new-reload\',
    );

但我的理解是，这只会删除列出的查询字符串，所以page 不应移除。任何帮助或指导都将不胜感激。

$page = get_query_var(\'page\');