抓取和分解數據

Question

我對PHP很陌生，我需要一些關於從文件中爆炸數據的幫助。有問題的文件是：http://data.vattastic.com/vatsim-data.txt

基本上，我需要得到的數據下!CLIENTS:部分（底部附近）。有了這些數據，我需要將其爆炸並獲取每個:之間的信息。

我曾嘗試與此代碼，但它給了我一個可變的偏移誤差（Undefined offset: 3）

$file = file("http://data.vattastic.com/vatsim-data.txt"); 
foreach($file as $line) 
{ 
    $data_record = explode(":", $line); 

    // grab only the data that has "ATC" in it... 
    if($data_record[3] == 'ATC' && $data_record[16] != '1' && $data_record[18] != '0'&& stristr($data_record[0],'OBS') === FALSE) 
    { 
     rest of code here... 
    } 
} 

如果有人能幫助我，我會非常感激。

Answer 1

這是因爲你正試圖爆炸這樣行：

; ！一般包含一般設置

當爆炸那行，你的$data_records看起來是這樣的：

陣列（！ [0] =>;一般包含一般設置）

快速解決方案：

$file = file("http://data.vattastic.com/vatsim-data.txt"); 
foreach($file as $line) 
{ 
    if(strpos($line,';') === 0) continue ; // this is comment. ignoring 
    $data_record = explode(":", $line); 
    $col_count = count($data_record); 

    switch($col_count) { 
    case 42: // columns qty = 42, so this is row from `clients` 
     // grab only the data that has "ATC" in it... 
     if($data_record[3] == 'ATC' && $data_record[16] != '1' && $data_record[18] != '0'&& stristr($data_record[0],'OBS') === FALSE) 
     { 
      rest of code here... 
     } 
     break; 
    default: 
     // this is other kind of data, ignoring 
     break; 
    } 
} 

Answer 2

另一種解決方案是將u請輸入正則表達式並查找!CLIENTS:部分。這也適用於客戶未來有多於或少於42列的情況

$file = file_get_contents ("http://data.vattastic.com/vatsim-data.txt"); 
$matches = null; 
preg_match ('/!CLIENTS:\s\n(.*)\n;/s' , $file, $matches); 
if($matches) 
{ 
    $client_lines = explode("\n", $matches[1]); 
    foreach ($client_lines as $client) 
    { 
    $data_record = explode(":", $client); 
    if($data_record[3] == 'ATC' && $data_record[16] != '1' && $data_record[18] != '0'&& stristr($data_record[0],'OBS') === FALSE) 
    { 
     //rest of code here... 
    } 
    } 
}