如何从Directory Iterator循环中排除文件类型 [英] How to exclude file types from Directory Iterator loop

问题描述

简单的目录迭代器是递归的，并显示所有文件和目录/子目录。

Simple directory iterator that is recursive and shows all files and directories/sub-directories.

我没有看到任何内置函数来排除某些文件类型，例如在以下示例中，我不想输出任何图像相关的文件，例如 .jpg ， .png 我知道有几种方法来做这个，寻找最好的建议。

I don't see any built in function to exclude certain file types, for instance in the following example I do not want to output any image related files such as .jpg, .png, etc. I know there are several methods of doing this , looking for advice on which would be best.

$scan_it = new RecursiveDirectoryIterator("/example_dir");

 foreach(new RecursiveIteratorIterator($scan_it) as $file) {

  echo $file;
  }

推荐答案

更新： / strong>
好​​的，所以我是个白痴。 PHP有一个内置的： pathinfo（）

尝试这个：

$filetypes = array("jpg", "png");
$filetype = pathinfo($file, PATHINFO_EXTENSION);
if (!in_array(strtolower($filetype), $filetypes)) {
  echo $file;
}

---

：

为什么不在文件名上运行 substr（），看看它是否与扩展名匹配您要排除的文件类型：

Why not just run substr() on the filename and see if it matches the extension of the file type you want to exclude:

$scan_it = new RecursiveDirectoryIterator("/example_dir");

foreach(new RecursiveIteratorIterator($scan_it) as $file) {
  if (strtolower(substr($file, -4)) != ".jpg" && 
      strtolower(substr($file, -4)) != ".jpg") {
    echo $file;
  }
}

您可以使用正则表达式更容易： / p>

You could make it easier by using regular expressions:

if (!preg_match("/\.(jpg|png)*$/i", $file, $matches)) {
   echo $file;
}

甚至可以使用一个数组来跟踪你的文件类型： p>

You could even use an array to keep track of your file types:

$filetypes = array("jpg", "png");
if (!preg_match("/\.(" . implode("|", $filetypes) . ")*$/i", $file, $matches)) {
   echo $file;
}

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