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PHP 中文件上傳的方法通常是通過 HTML 的表單來實現。上傳文件時,需要使用 enctype="multipart/form-data"
屬性來指定表單數據編碼類型為multipart/form-data
。
以下是一個簡單的文件上傳表單示例:
<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>
在 upload.php
文件中,可以使用 $_FILES
超全局數組來獲取上傳的文件信息。以下是一個簡單的文件上傳處理示例:
<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file, PATHINFO_EXTENSION));
// 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.";
}
}
?>
以上代碼會將上傳的文件保存到 uploads/
目錄,并輸出上傳成功或失敗的信息。在實際項目中,還可以添加更多的文件驗證和安全檢查。
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