我在我们的 wordpress 网站上使用了一个 xml 文件，每次有人查看帖子时都会使用帖子 ID 进行更新。
文件结构是这样的……</p>
<?xml version="1.0"?>
<posts>
<refresh>
<datetime>2013-01-04 08:48:21</datetime>
</refresh>
<post id="21931">
<postviews>5</postviews>
</post>
<post id="25420">
<postviews>18</postviews>
</post>
<post id="17770">
<postviews>25</postviews>
</post>
<post id="24925">
<postviews>4</postviews>
</post>
</posts>
每次有人查看帖子时，如果帖子 ID 不在文件中，它会添加一个新节点，或者如果它存在，则会将当前值更新 1。
我遇到的问题是，有时文件没有被正确写入，最终被损坏并如下所示（错误总是在文件的底部）......</p>
<?xml version="1.0"?>
<posts>
<refresh>
<datetime>2013-01-04 08:48:21</datetime>
</refresh>
<post id="21931">
<postviews>5</postviews>
</post>
<post id="25420">
<postviews>18</postviews>
</post>
<post id="17770">
<postviews>25</postviews>
</post>
</posts>
id="24925">
<postviews>4</postviews>
</post>
</posts>
我已经和我们的托管公司谈过了，问题没有显示为服务器错误。写入 XML 文件的脚本可能有问题吗？我写的脚本如下……</p>
<?php
// echo get_the_ID();
if($post->post_status != "publish" || is_user_logged_in()) {
//Get the wordpress postID
$postID = get_the_ID();
$postData = get_post($postID);
// Don't do anything if the post isn't published or being viewed by logged in users - will give a false impression
// echo $postID.'<br />'.$postData->post_title.'<br />'.$postData->post_date_gmt.'<br />';
} else {
//Get the wordpress postID
$postID = get_the_ID();
$postData = get_post($postID);
// echo $postID.'<br />'.$postData->post_title.'<br />'.$postData->post_date_gmt.'<br />';
$xmlFile = get_stylesheet_directory().'/most-read/most-read-posts.xml';
// load the document
$xml = simplexml_load_file($xmlFile);
// Get the server time
$serverTime = date('Y-m-d H:i:s');
// Is their a refresh node with an entry of datetime?
$refreshNodeExists = $xml->xpath("//refresh");
// Count it if
$countrefreshNodeExists = count($refreshNodeExists);
// If it does exists
if($countrefreshNodeExists != 0) { // If the ID is already in the file
$xmlRefresh = $xml->refresh->datetime;
// echo 'Refresh time is already set<br /><br />';
} else {
// echo 'Refresh time is not set<br /><br />';
$refreshNode = $xml->addChild('refresh');
$refreshNode->addChild('datetime', $serverTime);
}
// Check the time elapsed between the server time and the refreshNode
// Get and format the refreshNode
$to_time = strtotime($xmlRefresh);
// Get and format the server time
$from_time = strtotime($serverTime);
// Calculate the time elapsed
$refreshTimeElapsed = round(abs($to_time - $from_time) / 60,2);
// How long do we want to have between file refreshing - in minutes?
$refreshInterval = 120;
// Check if the time elapsed is more or less than $refreshInterval
if ($refreshTimeElapsed > $refreshInterval) {
// FOR TESTING ONLY - Show the time elapsed
// echo 'Ooops were over the refresh limit. It\'s currently at: '.$refreshTimeElapsed.' minutes.<br /><br />';
$fh = fopen($xmlFile, 'w') or die("can't open file");
$stringData = '<?xml version="1.0"?><posts><refresh><datetime>'.date('Y-m-d H:i:s').'</datetime></refresh></posts>';
fwrite($fh, $stringData);
fclose($fh);
/*$test = $xml->xpath("//post");
if (!empty($test)) {
echo 'Houston, we have posts';
} else {
echo 'That\'s a negative Houston, we have no posts here';
}*/
// Reset the datetime node with the current datetime to start the refresh loop again.
$xml->refresh->datetime = date('Y-m-d H:i:s');
} else { // Don't need to do anything here really
// FOR TESTING ONLY - show how much time has elapsed
// echo 'No need to change the refresh node. It\'s only at '.$refreshTimeElapsed.' minutes.<br /><br />';
// Check to see if the post id is already in the xml file - has it already been set?
$nodeExists = $xml->xpath("//post[@id=".$postID."]");
//Count the results
$countNodeExists = count($nodeExists);
if($countNodeExists > 0) { // If the ID is already in the file
// echo 'ID already here';
// get the correct node
$result = $xml->xpath("//post[@id=".$postID."]/postviews");
// heres the trick - the first result of xpath, and the node value (stored in [0])
$result[0][0] = $result[0][0]+1;
} else { // If the ID isn;'t there, add a new entry in the xml file for the post
//echo 'ID added';
$postNode = $xml->addChild('post'); // adding a new <post> to the top level node
$postNode->addAttribute('id', $postID); // adding a <postid> inside the new <post>
$postNode->addChild('postviews', 1); // adding a postviews inside the new <post>
}
// save the updated document and format it using the DOMDocument class
//$xml->asXML($xmlFile);
$dom = new DOMDocument('1.0');
$dom->preserveWhiteSpace = false;
$dom->formatOutput = true;
$dom->loadXML($xml->asXML());
$dom->save($xmlFile);
} // End if ($refreshTimeElapsed > $refreshInterval) {
} // End if logged in or not published
?>