在 CentOS 系統中，使用 PHP 實現文件上傳需要遵循以下步驟：
<!DOCTYPE html>
<html>
<head>
<title>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>
注意 enctype="multipart/form-data" 屬性，這是實現文件上傳所必需的。
<?php
$target_dir = "uploads/"; // 指定上傳文件的目錄
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]); // 獲取上傳文件的完整路徑
$uploadOk = 1; // 初始化上傳標志
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION)); // 獲取文件擴展名
// 檢查文件是否為圖片
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.";
$uploadOk = 0;
}
}
// 檢查文件是否已存在
if (file_exists($target_file)) {
echo "Sorry, file already exists.";
$uploadOk = 0;
}
// 檢查文件大小
if ($_FILES["fileToUpload"]["size"] > 500000) { // 限制文件大小為 500KB
echo "Sorry, your file is too large.";
$uploadOk = 0;
}
// 允許特定文件格式
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
$uploadOk = 0;
}
// 檢查 $uploadOk 是否設置為 0，如果是，則發生錯誤
if ($uploadOk == 0) {
echo "Sorry, your file was not uploaded.";
// 如果一切順利，嘗試上傳文件
} 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.";
}
}
?>
這個 PHP 腳本會檢查上傳的文件是否為圖片、文件大小是否超過限制以及文件擴展名是否允許。如果一切順利，文件將被上傳到指定的目錄。
sudo yum install epel-release
sudo yum install httpd php php-mysqlnd
sudo systemctl start httpd
sudo systemctl enable httpd
sudo mkdir uploads
sudo chown apache:apache uploads
sudo chmod 755 uploads
現在，你應該可以通過訪問 HTML 表單頁面來測試文件上傳功能了。
