PHP SPL RecursiveDirectoryIterator-getPath和ltrim路径

这里是n00b，耐心点：）

我需要从images目录中获取一个JPG列表，并将其子目录名称显示为给定图像的CSS div类。我可以做到这一点，但我不知道如何在没有任何指向它的路径的情况下，只获取作为div类的封闭目录名。i、 e

图像路径为：images2/food/hotdog.jpg 我需要：

”；
?>    

您似乎缺少了一些花括号。你应该把所有你想发生的事情放在foreach循环的花括号里。if语句也是如此。如果没有花括号，则只有下一行应用于上一条语句

另外，我认为ltrim语句的参数应该是“images2/”

---

AndrewR已经提供了一个您可以使用的解决方案。但它不能处理两种边缘情况。如果您的文件扩展名是“JPG”，该怎么办？如果您的文件根本没有扩展名怎么办

<?php
$theList = ''; // initialize the variables you're using!
$allowed = array("jpg" => true, "jpeg" => true);
$it = new RecursiveDirectoryIterator('images2');
$rit = new RecursiveIteratorIterator($it);
foreach ($rit as $file) {
  $pos = strrpos($file, '.');
  if ($pos === false) {
    // file doesn't contain a . (has no extension)
    continue;
  }
  // file might be named foo.JPG (sadly quite common for windows / certain cameras)
  $extension = strtolower(substr($file, $pos+1));
  if (!isset($allowed[$extension])) { // this is a bit faster than in_array()
    // $extension is not allowed
    continue;
  }

  // what happens with your class, when you encounter a sub-directory like images2/my-images/easter-holidays/foo.jpg
  // that won't be accessible from CSS (without major escaping action)
  // try to keep classNames alphanumeric (like-this-class-name)
  $path = $file->getPath();
  $folder = ltrim($path, "images2/");

  // always, ALWAYS, respect the context! 
  // htmlspecialchars() go around any non-literal output you make!
  $thelist .= '<div class="' . htmlspecialchars($folder) . '"><a href="'
    . htmlspecialchars($file->getPath()) . '/' . htmlspecialchars($file->getFilename()) 
    . '"rel="shadowbox[' . htmlspecialchars($file->getPath()) . ']">' 
    . '<img src="../slir/w180-h180-c1:1/test/isotope/' . htmlspecialchars($file->getPath()) 
    . '/' . htmlspecialchars($file->getFilename()) . '" /></a></div>';
}

---

Protip：文件扩展名与以下内容一样简单：

end（分解（“.”，$path））

因此，让我们：

$ite = new RecursiveDirectoryIterator("/mnt/shared/Media/Music/");
// Here are some extensions I want to keep
$keepers = array('ogg', 'mp3', 'wav', 'flac');
foreach (new RecursiveIteratorIterator($ite) as $filename => $cur) {
    // This bit of magic lowercases the file extension by grabbing everything past the last
    // '.' and checking whether said string is within the $keepers array, otherwise we just
    // skip this iteration and go on to the next.
    if (!in_array(end(explode(".", strtolower($filename))), $keepers)) { continue; }
    // Every $filename past here is fine as wine
    doit($filename); // :D
}

我想这可能是语法问题（卷曲的引号）。你的解释帮助很大。非常感谢。这看起来很棒，非常完整。我必须查找htmlspecialcharacters函数，但这很有意义。不幸的是，当我尝试这一个，它没有工作。只是一张空白页。
<?php
$theList = ''; // initialize the variables you're using!
$allowed = array("jpg" => true, "jpeg" => true);
$it = new RecursiveDirectoryIterator('images2');
$rit = new RecursiveIteratorIterator($it);
foreach ($rit as $file) {
  $pos = strrpos($file, '.');
  if ($pos === false) {
    // file doesn't contain a . (has no extension)
    continue;
  }
  // file might be named foo.JPG (sadly quite common for windows / certain cameras)
  $extension = strtolower(substr($file, $pos+1));
  if (!isset($allowed[$extension])) { // this is a bit faster than in_array()
    // $extension is not allowed
    continue;
  }

  // what happens with your class, when you encounter a sub-directory like images2/my-images/easter-holidays/foo.jpg
  // that won't be accessible from CSS (without major escaping action)
  // try to keep classNames alphanumeric (like-this-class-name)
  $path = $file->getPath();
  $folder = ltrim($path, "images2/");

  // always, ALWAYS, respect the context! 
  // htmlspecialchars() go around any non-literal output you make!
  $thelist .= '<div class="' . htmlspecialchars($folder) . '"><a href="'
    . htmlspecialchars($file->getPath()) . '/' . htmlspecialchars($file->getFilename()) 
    . '"rel="shadowbox[' . htmlspecialchars($file->getPath()) . ']">' 
    . '<img src="../slir/w180-h180-c1:1/test/isotope/' . htmlspecialchars($file->getPath()) 
    . '/' . htmlspecialchars($file->getFilename()) . '" /></a></div>';
}

$ite = new RecursiveDirectoryIterator("/mnt/shared/Media/Music/");
// Here are some extensions I want to keep
$keepers = array('ogg', 'mp3', 'wav', 'flac');
foreach (new RecursiveIteratorIterator($ite) as $filename => $cur) {
    // This bit of magic lowercases the file extension by grabbing everything past the last
    // '.' and checking whether said string is within the $keepers array, otherwise we just
    // skip this iteration and go on to the next.
    if (!in_array(end(explode(".", strtolower($filename))), $keepers)) { continue; }
    // Every $filename past here is fine as wine
    doit($filename); // :D
}