Question

（在有人问之前......我不能在这个项目中使用MySQL数据库。）

使用PHP，我需要从flatfile数据库创建嵌套的UL。我遇到的问题是我不希望显示重复的项目。我可以进一步解释，但是如果你看看下面的代码，你会看到数据和目标。谢谢。

平面数据：

section|category|service
Section One|Category One|
Section One|Category Two|SC1
Section One|Category Two|SC2
Section One|Category Two|SC3
Section One|Category Two|SC4
Section One|Category Three|
Section Two|Category Four|SC5
Section Two|Category Four|SC6
Section Three|Category Five|SC7

HTML目标输出

<ul class="section">
    <li>Section One
        <ul class="category">
            <li>Category One</li>
                <!-- no service -->
        </ul> <!-- /category -->
        <ul class="category">
            <li>Category Two</li>
                <ul class="service">
                    <li>SC1</li>
                    <li>SC2</li>
                    <li>SC3</li>
                    <li>SC4</li>
                </ul> <!-- /service -->
            </li>
        </ul> <!-- /category -->
        <ul class="category">
            <li>Category Three</li>
                <!-- no service -->
        </ul> <!-- /category -->
    </li>
</ul> <!-- /section -->

<ul class="section">
    <li>Section Two
        <ul class="category">
            <li>Category Four</li>
                <ul class="service">
                    <li>SC5</li>
                    <li>SC6</li>
                </ul> <!-- /service -->
            </li>
        </ul> <!-- /category -->
    </li>
</ul> <!-- /section -->

<ul class="section">
    <li>Section Three
        <ul class="category">
            <li>Category Five</li>
                <ul class="service">
                    <li>SC7</li>
                </ul> <!-- /service -->
            </li>
        </ul> <!-- /category -->
    </li>
</ul> <!-- /section -->

我的第一次尝试......认为我需要首先检查“部分”是否存在，然后将当前“部分”分配给“section_last”，以将下一个“部分”与当前“部分”值进行比较。 ..如果没有，打印“部分”......然后打印到类别上。我没有对“服务”价值部分进行编码，因为我对该部分没有任何成功。类别值。似乎我遇到了这个背后的'逻辑'的问题，或者可能有一种方法可以将循环中的过去值与PHP提供的下一个值进行比较。

在看到来自@Kyle S的示例代码之后，我可能在完全错误的路径上进行编码。

<?php 
$section = '';
$category = '';
$service = '';
$section_last = '';
$category_last = '';
$service_last = '';

$x = 0;

$file = fopen("categories_data.txt", "r");
if (!$file) { echo 'ERROR: Unable to open file: <strong>'.$file.'</strong>'; }
fgets($file); // IGNORE FIRST LINE IN FLATFILE - column names

while (!feof($file) ) {
    $lines = fgets($file);
    $ele = explode('|', $lines);

    $section = $ele[0];
    $category = $ele[1];
    $service = $ele[2];

    $service = str_replace(array("\n", "\r", "\r\n", "\n\r"), '',$service);

    if(strlen($section)>0) {
        if(!($section == $section_last)) {
            echo '
    <ul>
        <li>'.$section;
            $section_last = $section;
            $x++;
        }
    }
    echo '
            <ul><li>'.$category.' > '.$service.'</li></ul>
';
        if($x) {
            if($section != $section_last) {
                echo '
        </li>
    </ul>
';
        }
    }


} // end $data_file WHILE

fclose($file);
?>

Answer 1

我建议使用嵌套数组并使用PHP的service函数检查in_array项是否存在。

例如，要添加单行的数据，请先检查服务是否存在：

$data = explode("|", $line);
$section = $data[0];
$category = $data[1];
$service = $data[2];

if ( !array_key_exists($section, $tree) ) {
    $tree[$section] = array();
}

if ( !array_key_exists($category, $tree[$section]) ) {
    $tree[$section][$category] = array(); 
}

if ( !in_array($service, $tree[$section][$category]) ) {
    $tree[$section][$category][] = $service;
}

Answer 2

我不能赞成这个解决方案。我被另一个网站的专家回答。但是，我真的觉得这个主题非常重要，可以在这个“堆栈”网站上重新发布这个解决方案。

<强> SOLUTION：

<?php
define('TAB', "\t");
define('TAB2', "\t\t");

// Open the input file 
$file = fopen('lines.csv', 'rt');
// ignore the first line 
fgets($file);
// Get the next line into an array splitting on the pipe 
$line = fgetcsv($file, 255, '|');

// set the initial section value 
$section = $line[0];
// Initialise batch array
$current = array();
// Loop through all lines in the file 
do {
// If this line contains a section that is not the same as the previous line then dump the last section
  if ($section != $line[0]) {
    dump_categories($current, $section);
// Set our section flag to the next section    
    $section = $line[0];
// Clear the array of batched items to dump    
    $current = array();
  }
// Add the line to the batch
  $current[] = $line;
} while($line = fgetcsv($file, 255, '|'));
// Remember to dump batch that has built up
dump_categories($current, $section);
fclose($file);

function dump_categories(& $lines, $section)
{
// Set our category flag
  $category = $lines[0][1];
// initialise batch array
  $current = array();
// Start a new seection  
  echo '<ul class="section">' . PHP_EOL;
  echo TAB . '<li>' . $section . PHP_EOL;
// If there are categories in this section then process them - don't want empty bullets here  
  if (!empty($lines[0][1])) {
    foreach($lines as $l) {
// if this is a new category then dump category and services for this category    
      if ($category != $l[1]) {
        dump_services($current, $category);
// set our category flag        
        $category = $l[1];
// ... and clear the batch array        
        $current = array();
      }
// add to batch      
      $current[] = $l;
    }
// and dump batched lines    
    dump_services($current, $category);
  }
  echo TAB . '</li>' . PHP_EOL;
  echo '</ul>';
}
// Services we assume is the end of the line so output the service if it exists.
function dump_services(& $lines, $category)
{
  echo TAB2 . '<ul class="category">' . PHP_EOL;
  echo TAB . TAB2 . '<li>' . $category . PHP_EOL;
  if (!empty($lines[0][2])) {
    echo TAB2 . TAB2 . '<ul class="service">' . PHP_EOL;
    foreach($lines as $l) {
      if (!empty($l)) {
        echo TAB . TAB2 . TAB2 . '<li>' . $l[2] . '</li>' . PHP_EOL;
      }
    }
    echo TAB2 . TAB2 . '</ul>' . PHP_EOL;
  }
  echo TAB . TAB2 . '</li>' . PHP_EOL;
  echo TAB2 . '</ul>' . PHP_EOL;
}
?>

PHP - 从平面文件创建UL嵌套列表

2 个答案: