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：

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。

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。

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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