从文本文件和 PHP 中的一行编辑特定记录 - Edit specific record from a line in text file and PHP

Edit specific record from a line in text file and PHP

我正在尝试用PHP和文本文件制作一个简单的新闻点击计数器。我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
  }
}

问题是我无法更改新闻点击！例如，我需要将第二行的命中数从 241 更改为 242，并将其再次写入 txt 文件。

我在这个网站和谷歌上搜索并尝试了一些方法，但我无法解决这个问题。

至少，您忘记将增量写回文件。此外，您将希望将每一行解析为可以使用的列（由竖线|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

您可以读取该文件并执行以下操作：

//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，您拥有包含每个新闻项的数组$News，您可以根据需要更改它们（例如：$News[2]['views'] = 242;）。

您现在唯一缺少的是写回文件部分，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);

就是这样！:)