打开多个文件并将其数据写入一个文件，包括换行符

Question

我有多个包含字符串的.m3u文件，例如：

string1
string2 etc //(with the line break)

我想将此信息添加到一个文件中，但是当它到达文件末尾时，请添加换行符。因为当我做代码时它可以工作，但是当它连接下一个文件时，我得到的结果如下：

string10
string11string12
string13

我想防止这种情况并将所有内容添加到新行。代码如下：

<?PHP
//File path of final result
$longfilepath = "/var/lib/mpd/playlists/";
$filepathsArray = [$longfilepath."00's.m3u",$longfilepath."50's.m3u",$longfilepath."60's.m3u",$longfilepath."70's.m3u",$longfilepath."80's.m3u",$longfilepath."90's.m3u",$longfilepath."Alternative Rock.m3u",$longfilepath."Best Of Irish.m3u",$longfilepath."Blues.m3u",$longfilepath."Chart Hits.m3u",$longfilepath."Christmas.m3u",$longfilepath."Classic Rock.m3u",$longfilepath."Classical Opera.m3u",$longfilepath."Country.m3u",$longfilepath."Dance.m3u",$longfilepath."Disco.m3u",$longfilepath."Easy Listening.m3u",$longfilepath."Electric Rock.m3u",$longfilepath."Hard Rock.m3u",$longfilepath."Irish Country.m3u",$longfilepath."Jazz.m3u",$longfilepath."Live and Acoustic.m3u",$longfilepath."Love Songs.m3u",$longfilepath."Pop.m3u",$longfilepath."Rap and RnB.m3u",$longfilepath."Reggae.m3u",$longfilepath."Relaxation.m3u",$longfilepath."Rock and Roll.m3u",$longfilepath."Rock.m3u",$longfilepath."Soul.m3u",$longfilepath."Soundtracks.m3u",$longfilepath."Top Bands.m3u"];
$filepath = "mergedfiles.txt";
$out = fopen($filepath, "w");
//Then cycle through the files reading and writing.
foreach($filepathsArray as $file){
  $in = fopen($file, "r");
  while ($line = fgets($in)){
       fwrite($out, $line."n"); //My attempt to add new line (which works) but then adds an extra for those that dont need it.
  }
  fclose($in);
}
//Then clean up
fclose($out);
?>

我使用：

fwrite($out, $line."n");

但后来我得到的结果如下：

string1
string2
string3
string4
string5

Answer 1

在添加自己的换行符之前 - 删除所有可以在带有 trim（甚至空行）的字符串中的换行符：

foreach($filepathsArray as $file){
  $in = fopen($file, "r");
  while ($line = fgets($in)) {
       $line = trim($line);
       if ($line) {
           // if line is not empty - write it to a file
           fwrite($out, $line . "n");
       }
  }
  fclose($in);
}

Answer 2

这可能更容易：

$out = array();
foreach($filepathsArray as $file) {
    $out = array_merge($out, file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES));
}
file_put_contents($filepath, implode("n", $out));

• 将文件读入数组，忽略换行符和空行
• 使用换行符内爆数组并写入最终文件

注意：您可能需要在rn上内爆才能在某些 Windows 应用程序（如记事本）中看到换行符。