从文本文件和PHP中的一行编辑特定记录

Question

我试图用PHP和文本文件制作一个简单的新闻点击计数器。我编写了一个简单的代码来检查和读取文件：

文本文件：

//Data in Source File
//Info: News-ID|Hits|Date
1|32|2013-9-25
2|241|2013-9-26
3|57|2013-9-27

PHP文件：

//Get Source
$Source = ENGINE_DIR . '/data/top.txt';
$Read = file($Source);

//Add New Record
foreach($Read as $News){
  //Match News ID
  if($News[0] == "2"){
    //Add New Record and Update the Text File
  }
}

问题是我不能改变新闻热点！例如，我需要将第二行的点击量从241更改为242，并将其再次写入txt文件。

我在这个网站和谷歌搜索，并尝试了一些方法，但我无法修复。

Answer 1

至少，您忘记将增量写回文件。另外，您需要将每一行解析为可以使用的列(由管道|分隔)。

未经测试的代码，但想法是：

$Source = ENGINE_DIR . '/data/top.txt'; // you already have this line
$Read = file($Source); // and this one

foreach ( $Read as $LineNum => $News ) { // iterate through each line
    $NewsParts = explode('|',$News); // expand the line into pieces to work with
    if ( $NewsParts[0] == 2 ) { // if the first column is 2
        $NewsParts[1]++; // increment the second column
        $Read[$LineNum] = implode('|',$NewsParts); // glue the line back together, we're updating the Read array directly, rather than the copied variable $News
        break; // we're done so exit the loop, saving cycles
    }
}

$UpdatedContents = implode(PHP_EOL,$Read); // put the read lines back together (remember $Read as been updated) using "\n" or "\r\n" whichever is best for the OS you're running on
file_put_contents($Source,$UpdatedContents); // overwrite the file

Answer 2

您可以读取该文件并执行如下操作：

//Get Source
$Source = ENGINE_DIR . '/data/top.txt';
$Read = file($Source);

$News = array();

foreach ($Read as $line) {
    list($id, $views, $date) = explode('|', $line);
    $News[$id] = array(
        'id' => $id,
        'views' => $views,
        'date' => $date,
    );
}

此时，您有一个包含每个新闻条目的数组$News，您可以根据自己的意愿对它们进行更改(例如：$News[2]['views'] = 242;)。

您现在所缺少的唯一东西就是将其写回文件部分，这也很容易。

$fh = fopen(ENGINE_DIR . '/data/top.txt', 'w'); //'w' mode opens the file for write and truncates it

foreach ($News as $item) {
    fwrite($fh, $item['id'] . '|' . $item['views'] . '|' . $item['date'] . "\n");
}

fclose($fh);

就这样！)