Debian PHP如何进行文件上传

在Debian系统上使用PHP进行文件上传，你需要遵循以下步骤：

1. 创建一个HTML表单，用于上传文件：

<
    !DOCTYPE html>
    
<
    html>
    
<
    head>
    
    <
    title>
    PHP File Upload<
    /title>
    
<
    /head>
    
<
    body>
    

<
    form action="upload.php" method="post" enctype="multipart/form-data">
    
  Select image to upload:
  <
    input type="file" name="fileToUpload" id="fileToUpload">
    
  <
    input type="submit" value="Upload Image" name="submit">
    
<
    /form>
    

<
    /body>
    
<
    /html>
    

这个表单的action属性指向一个名为upload.php的PHP文件，用于处理文件上传。

1. 创建一个名为upload.php的PHP文件，用于处理文件上传：

<
    ?php
$target_dir = "uploads/";
    
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
    
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
    
$uploadOk = 1;


// Check if image file is an actual image or fake image
if(isset($_POST["submit"])) {
    
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);

    if($check !== false) {
    
        echo "File is an image - " . $check["mime"] . ".";
    
        $uploadOk = 1;

    }
 else {
    
        echo "File is not an image.";
    
        $uploadOk = 0;

    }

}


// Check if file already exists
if (file_exists($target_file)) {
    
    echo "Sorry, file already exists.";
    
    $uploadOk = 0;

}
    

// Check file size
if ($_FILES["fileToUpload"]["size"] >
 500000) {
    
    echo "Sorry, your file is too large.";
    
    $uploadOk = 0;

}
    

// Allow certain file formats
if($imageFileType != "jpg" &
    &
     $imageFileType != "png" &
    &
     $imageFileType != "jpeg"
&
    &
 $imageFileType != "gif" ) {
    
    echo "Sorry, only JPG, JPEG, PNG &
     GIF files are allowed.";
    
    $uploadOk = 0;

}


// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    
    echo "Sorry, your file was not uploaded.";

// if everything is ok, try to upload file
}
 else {

    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
    
        echo "The file ". htmlspecialchars( basename( $_FILES["fileToUpload"]["name"])). " has been uploaded.";

    }
 else {
    
        echo "Sorry, there was an error uploading your file.";

    }

}
    
?>
    

这个PHP脚本首先检查上传的文件是否为图片，然后检查文件是否已经存在，接着检查文件大小是否超过限制，最后检查文件类型是否允许。如果所有条件都满足，文件将被上传到uploads/目录。

1. 确保uploads/目录存在并具有适当的权限：

mkdir uploads
chmod 755 uploads

现在，你可以运行你的HTML表单并通过PHP脚本上传文件了。

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