为什么 $count 没有更新？

发布于 2024-07-29 17:05:55 字数 558 浏览 7 评论 0原文

   $dir_handle = @opendir($url) or die("Unable to open $url");
   $count = "0";
   while ($file = readdir($dir_handle)) {
      if (!is_dir($url.'/'.$file) && ($file="*.jpg" || $file="*.gif" || $file="*.png") && $file!="picture0.*") {
         $galleryEventFile[$count] = $file;
         $count++;
      }
   }
   closedir($dir_handle);

我认为这与这一行有关：

if (!is_dir($url.'/'.$file) && ($file="*.jpg" || $file="*.gif" || $file="*.png") && $file!="picture0.*")

但我不确定

原文

   $dir_handle = @opendir($url) or die("Unable to open $url");
   $count = "0";
   while ($file = readdir($dir_handle)) {
      if (!is_dir($url.'/'.$file) && ($file="*.jpg" || $file="*.gif" || $file="*.png") && $file!="picture0.*") {
         $galleryEventFile[$count] = $file;
         $count++;
      }
   }
   closedir($dir_handle);

I think it has something to do with this line:

if (!is_dir($url.'/'.$file) && ($file="*.jpg" || $file="*.gif" || $file="*.png") && $file!="picture0.*")

but im not sure

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鹿童谣 2024-08-05 17:05:56

我可以看到两件事会给您带来问题：

赋值/比较：

您有代码：

if ($file="*.jpg" //etc...

但是，单个等号将执行赋值，而不是比较 - 您需要使用两个等号(==) 为此。请参阅 http://php.net/manual/en/language.operators.comparison .php。本质上，您通过在 if 语句中进行赋值所做的事情是：

$file = '*.jpg';
if ($file) { }

字符串的通配符匹配

您也不能在字符串上进行像 ($file == "*.jpg) 这样的通配符匹配，您可以考虑使用 preg_match() 和正则表达式，例如，

if (!preg_match('/\.jpg$/i', $file)) {
    //not .jpg
}

这样做可能会更好：

//get file extension
$extension = pathinfo($file, PATHINFO_EXTENSION);

$allowedExtensions = array('jpg', 'png', 'gif');

//check in allowed list
if (!in_array(strtolower($extension), $allowedExtensions)) {
    //not valid
}

I can see two things that will be causing you problems:

Assignment/comparison:

You have the code:

if ($file="*.jpg" //etc...

However, a single equal sign will perform an assignment, not a comparison - you need to use two equals signs (==) for this. See http://php.net/manual/en/language.operators.comparison.php. Essentially what you are doing by doing an assignment in an if statement is:

$file = '*.jpg';
if ($file) { }

Wildcard matching of strings

You also can't do wildcard matching like that ($file == "*.jpg) on a string, you could look at using preg_match() and regular expressions instead, e.g.

if (!preg_match('/\.jpg$/i', $file)) {
    //not .jpg
}

It might be better to do something like this though:

//get file extension
$extension = pathinfo($file, PATHINFO_EXTENSION);

$allowedExtensions = array('jpg', 'png', 'gif');

//check in allowed list
if (!in_array(strtolower($extension), $allowedExtensions)) {
    //not valid
}

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故事与诗 2024-08-05 17:05:56

首先，$count 应该是一个数字。做：

 $count = 0;

其次，据我所知，PHP 不支持这样的通配符匹配。不能使用"*"来匹配。您需要使用正则表达式来匹配条件。

First, $count should be a number. Do:

 $count = 0;

Second, AFAIK, PHP doesn't support wildcard matching like that. You can't use "*" to match. You'll need to use regular expressions to match in the conditional.

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