php 文件上传保存

// 检查PHP配置
php.ini
upload_max_filesize = 10M
post_max_size = 10M

// 表单设置
<form action="upload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="fileToUpload" id="fileToUpload">
    <input type="submit" value="Upload File" name="submit">
</form>

// 服务器权限
chmod 755 /path/to/upload/directory

$allowedTypes = array('image/jpeg', 'image/png', 'application/pdf');
if (in_array($_FILES['fileToUpload']['type'], $allowedTypes)) {
    // 处理上传
} else {
    echo "Invalid file type.";
}

$target_file = "/path/to/upload/directory/" . basename($_FILES["fileToUpload"]["name"]);
if (file_exists($target_file)) {
    $newFilename = uniqid() . "_" . basename($_FILES["fileToUpload"]["name"]);
    $target_file = "/path/to/upload/directory/" . $newFilename;
}
move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file);

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

// 检查是否为真实图片
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;
    }
}

// 检查文件是否已经存在
if (file_exists($target_file)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}

// 检查文件大小
if ($_FILES["fileToUpload"]["size"] > 500000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}

// 允许特定文件格式
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
    echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
    $uploadOk = 0;
}

// 检查 $uploadOk 是否设置为 0 通过前面的检查
if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";

// 如果一切正常，尝试上传文件
} 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.";
    }
}
?>