PHP File Exists返回false;當文件不實際存在

Question

最奇怪的事情發生在我身上，我正在開發一個簡單的文件上傳腳本，它的工作，但後來停止工作？ 所以我troubleshooted和隔離問題的事實，服務器不接受一個特定的文件夾實際存在的事實。代碼的基本要點如下所示（請原諒的代碼的混亂，這只是一個粗略的草稿在這一點...）：

基本的文件創建：

$date = date("y-m-d"); 
    $category = "tech";  
    $url_m = $_SERVER['DOCUMENT_ROOT']. "/" . $category . "/articles/" . $date . "/images/"; 
     if(!file_exists($url_m)){ 
      mkdir($url_m, 0777, true); 
      $segment = "/" . $category . "/articles/" . $date . "/"; 
     } 
     else{ 
      for($i = 1; $i <= 100; $i++){ 
       $url_new = $_SERVER['DOCUMENT_ROOT']. "/" . $category . "/articles/" . $date . "-" . $i . "/images/"; 
       $segment = "/" . $category . "/articles/" . $date . "-" . $i . "/"; 
       if(!file_exists($url_new)){ 
        echo $segment; 
        $url_m = $url_new; 
        mkdir($url_m, 0777, true); 
        echo $url_m; 
        break; 
       } 
       else{ 
        continue; 
       } 
      } 
     } 
     $name = $_FILES['file']['name']; 
     $url = "http://" . $_SERVER['SERVER_NAME'] . $segment; 
     $upload_url = str_replace("/images/", "", $url_m); 
     $pic_url = uploadFile($segment, $name, $_FILES['file']['type']); 

Now the UPLOAD script 

function uploadFile($dir, $name, $type){ 
     if(isset($_POST['submit'])){ 

     $allowed = array('gif','png','jpg','JPG','jpeg'); 
     $filename = $name; 
     $ext = pathinfo($filename, PATHINFO_EXTENSION); 
     if(!in_array($ext,$allowed)) { 
      echo 'error'; 
     }  

     $tmp_name = $_FILES['file']['tmp_name']; 
     $error = $_FILES['file']['error']; 

     if (isset ($name)) { 
      if (!empty($name)) { 

      $location ="<br>". $_SERVER['DOCUMENT_ROOT'].$dir. "images/"; 
       echo $location. "<br>"; 
       if(!file_exists($location)){echo "no";} 
if (!is_writeable($location.$name)) { 
    die("Cannot write to destination file"); 
} 
      if (move_uploaded_file($tmp_name, $location.$name)){ 
       $path = "http://" . $_SERVER['SERVER_NAME'] . $dir ."/images/". $name; 
       return $path; 
       } 
       else { return "WRONG";} 
       } else { 
        echo 'please choose a file'; 
        } 
      } 
     } 
     else{return 0;} 
    } 

像往常一樣，請知道我不會問這個問題，如果我還沒有先掙扎好幾個小時，並且非常感謝所有幫助！

編輯： 這裏是表單的HTML代碼：

<form method="post" action="../site-resources/db-config/db-post.php" enctype= "multipart/form-data"> 
News Category: 
    <select name = "category" id = "category" required> 
     ... 
    </select><br> 
Subcategory: 
    <select name = "subcategory" required > 
     ... 
    </select> 
    <br> 
Article Title: <input type="text" name="title" placeholder="Article Title" required /><br> 
Article Subtitle: <input type="text" name="subtitle" placeholder="Article Subtitle" required /><br> 
Author's Name: <input type="text" name="author_name" placeholder="Author Name" required /><br> 
Upload Image for Article: <input type = "file" name = "file" id = "image"><br> 
    Main Text:<br><textarea cols = "100" rows = "30" name = "article_body">Article Body Goes Here</textarea> 
<br><br> 
<h4>Security Question: Please Enter your Editor Code to post to this website</h4> 
<input type = "text" name = "security_question" placeholder="Security Question" required /> 

<input type="submit" name = "submit" value="Post Article" /> 

Answer 1

不知道這是否是實際proble。所以需要看到HTML表單，通常最忘記寫enctype。

添加enctype="multipart/form-data"形成，以使文件

<form id="someform" action="" enctype="multipart/form-data"> 

Answer 2

此作品的上傳！已測試

$date = date("y-m-d"); 
    $category = "tech";  
    $url_m = $_SERVER['DOCUMENT_ROOT'] . $category . "/articles/" . $date . "/images/"; 
     if(!file_exists($url_m)){ 
      mkdir($url_m, 0777, true); 
      $segment = $category . "/articles/" . $date . "/"; 
     } 
     else{ 
      for($i = 1; $i <= 100; $i++){ 
       $url_new = $_SERVER['DOCUMENT_ROOT'] . $category . "/articles/" . $date . "-" . $i . "/images/"; 
       $segment = $category . "/articles/" . $date . "-" . $i . "/"; 
       if(!file_exists($url_new)){ 
        echo $segment; 
        $url_m = $url_new; 
        mkdir($url_m, 0777, true); 
        echo $url_m; 
        break; 
       } 
       else{ 
        continue; 
       } 
      } 
     } 
     $name=isset($_FILES['file']['name'])?$_FILES['file']['name']:""; 
     $type=isset($_FILES['file']['type'])?$_FILES['file']['type']:""; 
     $url = "http://" . $_SERVER['SERVER_NAME'] . $segment; 
     $upload_url = str_replace("/images/", "", $url_m); 
     $pic_url = uploadFile($segment, $name, $type); 

//Now the UPLOAD script 

function uploadFile($dir, $name, $type){ 
     if(isset($_POST['submit'])){ 

     $allowed = array('gif','png','jpg','jpeg'); 
     $filename = $name; 
     $ext = strtolower(pathinfo($filename, PATHINFO_EXTENSION)); 
     echo $ext; 
     if(!in_array($ext,$allowed)) { 
      echo 'error'; 
     }  

     $tmp_name = $_FILES['file']['tmp_name']; 
     $error = $_FILES['file']['error']; 

     if (isset ($name)) { 
      if (!empty($name)) { 

      $location =$_SERVER['DOCUMENT_ROOT'].$dir. "images/"; 
       echo "location:".$location. "<br>"; 

       if(file_exists($location.$name)) 
       { 
        echo "file exists"; 
        if(!is_writeable($location.$name)) { 
        die("Cannot write to destination file. its not writable"); 
        } 
       } 
       else 
       { 
        echo "file doesn't exist"; 
       } 
      if (move_uploaded_file($tmp_name, $location.$name)){ 
       $path = "http://" . $_SERVER['SERVER_NAME'] . $dir ."/images/". $name; 
       echo "file moved"; 
       return $path; 
       } 
       else { return "WRONG";} 
       } else { 
        echo 'please choose a file'; 
        } 
      } 
     } 
     else{return 0;} 
    }