PHP file_exists（$ var）不起作用 [英] PHP file_exists($var) not working

问题描述

我试图在我的笔记本上写一些代码，并使用xampp环境。我有以下一段代码：

  class A {
 ... 
 foreach（$ blocks as $ block）{
 $ block ='dir / dir2 /'。 $块; 
 
 if（file_exists（$ block）== true）{
 $ var。= file_get_contents（$ block）; 
 
 
 
 
 $ b $ p $当我在foreach循环中回显$ block变量时，它会返回文件的路径。但是，file_exists函数总是返回false。你可以帮我弄清楚这里有什么问题吗？
 
解决方案
  file_exists 目的是检查提供的文件是否存在。这是返回false。这意味着你的文件不存在于php正在寻找的地方。 PHP可能正在寻找一个比你期望的不同领域。看来是时候进行一些调试了。
 
 
 
运行这个来找出php正在查找的位置。 
 
 
  echo当前工作目录是 - >。 GETCWD（）; 
  
这就是你想要php的样子吗？如果没有，那么改变目录php正在使用 chdir 函数。
 
 
  $ searchdirectory =c：\path\to\your\directory; //如果需要，使用unix样式路径
 chdir（$ searchdirectory）;然后运行你的函数（注意：为了与windows风格保持一致，我把斜杠翻转成了反斜杠）
 
 
  class A {
 ... 
 //改变工作目录
 $ searchdirectory =c：\path\to\your\directory; //如果需要，使用unix样式路径
 chdir（$ searchdirectory）; 
 
 foreach（$ blocks as $ block）{
 $ block ='dir \dir2\'。 $块; 
 $ b $ if（file_exists（$ block）== true）{
 $ var。= file_get_contents（$ block）; 
} 
} 
} 
  
 
I'm trying to write some code on my notebook and am using the xampp environment. I have the following piece of code:
class A {
...
  foreach ($blocks as $block) {
    $block = 'dir/dir2/' . $block;
  }
  if (file_exists($block) == true) {
    $var .= file_get_contents($block);
  }
}
When I echo the $block variable in the foreach loop, it gives back the path to the files. However, the file_exists function always returns false. Could you please help me figure out what's wrong here?
解决方案
file_exists purpose is to check if the supplied file exists. It's returning false. This means that the your file doesn't exist where php is looking. php might be looking in a different area than you expect. Looks like it's time for some debugging.

Run this to figure out where php is looking.
echo "current working directory is -> ". getcwd();
Is that where you want php to look? If not then change the directory php is looking in with the chdir function.
$searchdirectory = "c:\path\to\your\directory"; //use unix style paths if necessary
chdir($searchdirectory);
Then run your function (note: I flipped the slashes to backslashes in order to be consistent with windows style paths.)
class A {
...
  //change working directory
  $searchdirectory = "c:\path\to\your\directory"; //use unix style paths if necessary
  chdir($searchdirectory);

  foreach ($blocks as $block) {
    $block = 'dir\dir2\' . $block;

    if (file_exists($block) == true) {
      $var .= file_get_contents($block);
    }
  }
}


                        
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