filesize（）stat无法获取MP3文件的ID3标签

Question

它适用于本地文件，但不适用于外部域。这里是我的代码（这是我从http://www.barattalo.it/2010/02/22/reading-mp3-informations-with-php-id3-tags/了）：

<? 
function tagReader($file){ 
$id3v23 = array("TIT2","TALB","TPE1","TRCK","TDRC","TLEN","USLT"); 
$id3v22 = array("TT2","TAL","TP1","TRK","TYE","TLE","ULT"); 
$fsize = filesize($file); 
$fd = fopen($file,"r"); 
$tag = fread($fd,$fsize); 
$tmp = ""; 
fclose($fd); 
if (substr($tag,0,3) == "ID3") { 
    $result['FileName'] = $file; 
    $result['TAG'] = substr($tag,0,3); 
    $result['Version'] = hexdec(bin2hex(substr($tag,3,1))).".".hexdec(bin2hex(substr($tag,4,1))); 
} 
if($result['Version'] == "4.0" || $result['Version'] == "3.0"){ 
    for ($i=0;$i<count($id3v23);$i++){ 
     if (strpos($tag,$id3v23[$i].chr(0))!= FALSE){ 
      $pos = strpos($tag, $id3v23[$i].chr(0)); 
      $len = hexdec(bin2hex(substr($tag,($pos+5),3))); 
      $data = substr($tag, $pos, 10+$len); 
      for ($a=0;$a<strlen($data);$a++){ 
       $char = substr($data,$a,1); 
       if($char >= " " && $char <= "~") $tmp.=$char; 
      } 
      if(substr($tmp,0,4) == "TIT2") $result['Title'] = substr($tmp,4); 
      if(substr($tmp,0,4) == "TALB") $result['Album'] = substr($tmp,4); 
      if(substr($tmp,0,4) == "TPE1") $result['Author'] = substr($tmp,4); 
      if(substr($tmp,0,4) == "TRCK") $result['Track'] = substr($tmp,4); 
      if(substr($tmp,0,4) == "TDRC") $result['Year'] = substr($tmp,4); 
      if(substr($tmp,0,4) == "TLEN") $result['Length'] = substr($tmp,4); 
      if(substr($tmp,0,4) == "USLT") $result['Lyric'] = substr($tmp,7); 
      $tmp = ""; 
     } 
    } 
} 
if($result['Version'] == "2.0"){ 
    for ($i=0;$i<count($id3v22);$i++){ 
     if (strpos($tag,$id3v22[$i].chr(0))!= FALSE){ 
      $pos = strpos($tag, $id3v22[$i].chr(0)); 
      $len = hexdec(bin2hex(substr($tag,($pos+3),3))); 
      $data = substr($tag, $pos, 6+$len); 
      for ($a=0;$a<strlen($data);$a++){ 
       $char = substr($data,$a,1); 
       if($char >= " " && $char <= "~") $tmp.=$char; 
      } 
      if(substr($tmp,0,3) == "TT2") $result['Title'] = substr($tmp,3); 
      if(substr($tmp,0,3) == "TAL") $result['Album'] = substr($tmp,3); 
      if(substr($tmp,0,3) == "TP1") $result['Author'] = substr($tmp,3); 
      if(substr($tmp,0,3) == "TRK") $result['Track'] = substr($tmp,3); 
      if(substr($tmp,0,3) == "TYE") $result['Year'] = substr($tmp,3); 
      if(substr($tmp,0,3) == "TLE") $result['Lenght'] = substr($tmp,3); 
      if(substr($tmp,0,3) == "ULT") $result['Lyric'] = substr($tmp,6); 
      $tmp = ""; 
     } 
    } 
} 
return $result; 
} 
$song = tagReader("file.mp3"); 
echo $song[Title]; 
?> 

Answer 1

它与本地文件才有效。你不能通过远程mp3文件作为这个功能的参数，这是没有意义的。文件以fopen()打开，因此它们必须是本地文件。 filesize()同样的事情。

$fsize = filesize($file); 
    $fd = fopen($file,"r"); 

你究竟想用这个函数加载什么？你的意思是“它不适用于外部域名”？

该行只能与存储在与此脚本相同的目录中的file.mp3一起使用。

$song = tagReader("file.mp3"); 

如果您不能读取本地文件，那么您应该检查该文件的读取权限。

相同的原因为什么filesize()可能不起作用。

建议：应使用字母数字数组索引报价...

echo $song['Title']; // or 
    echo $song["Title"]; 

，而不是

echo $song[Title]; 

是的，它可能工作了，不过，你不应该这样做。我建议使用单引号以避免在某些特定情况下对变量名称进行评估（如数组索引，如$array['$index']）。