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我有一个填充了数字行的 txt 文件...我有一个代码，用户可以在其中过滤 txt 文件中的特定行

过滤代码：

<?php
$file = 'upload/filter.txt';
$searchfor = $_POST['search'];
$btn = $_POST['button'];
$sum = 0;

if($btn == 'search') {

//prevents the browser from parsing this as HTML.
header('Content-Type: text/plain');

// get the file contents, assuming the file to be readable (and exist)
 $contents = file_get_contents($file);

// escape special characters in the query
 $pattern = preg_quote($searchfor, '/');

// finalise the regular expression, matching the whole line
$pattern = "/^.*$pattern.*\$/m";


// search, and store all matching occurences in $matches
if(preg_match_all($pattern, $contents, $matches)){
echo "Found matches:\n";
echo implode("\n", $matches[0]);
 }
else{
echo "No matches found";
 }

 }
 ?>

例如，过滤的结果现在将从文本文件的 1,000,000 行中产生 4 行

0100002291310106200140001020055460000000001000000072860103508104 0100002291320106200140001020055460000000005000000072860103508101 0100002291330106200140001020055460000000001000000072860103508102 0100002291340106200140001020055460000000005000000072860103508109

我需要一个仅选择特定列并使用 PHP 代码将它们添加在一起的代码...示例我只想添加第 1-10 列，因此从上面给出的行中结构将如下所示

结构：

0100002291
0100002291
0100002291

请帮忙

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