如何處理PHP文件上傳格式錯誤並產生相應的報錯訊息

<?php
// 定义允许上传的文件类型
$allowedTypes = ['image/jpeg', 'image/png'];

// 获取上传文件的信息
$fileName = $_FILES['file']['name'];
$fileType = $_FILES['file']['type'];
$fileSize = $_FILES['file']['size'];
$fileTmpName = $_FILES['file']['tmp_name'];
$fileError = $_FILES['file']['error'];

// 检查文件类型是否允许上传
if (!in_array($fileType, $allowedTypes)) {
    $errorMessage = '文件格式错误！只能上传JPEG和PNG格式的图片。';
    // 生成报错信息
    echo $errorMessage;
    // 可以根据具体需求，将错误信息记录到日志中
    // logError($errorMessage);
} else {
    // 处理文件上传逻辑
    // move_uploaded_file函数将文件从临时文件路径移动到指定的目标路径
    move_uploaded_file($fileTmpName, 'uploads/' . $fileName);
    echo '文件上传成功！';
}

<?php
$allowedTypes = ['image/jpeg', 'image/png'];
$maxFileSize = 2 * 1024 * 1024; // 2MB
$uploadPath = 'uploads/';

$fileName = $_FILES['file']['name'];
$fileType = $_FILES['file']['type'];
$fileSize = $_FILES['file']['size'];
$fileTmpName = $_FILES['file']['tmp_name'];
$fileError = $_FILES['file']['error'];

if (!in_array($fileType, $allowedTypes)) {
    $errorMessage = '文件格式错误！只能上传JPEG和PNG格式的图片。';
    echo $errorMessage;
} elseif ($fileSize > $maxFileSize) {
    $errorMessage = '文件过大！请上传不超过2MB的文件。';
    echo $errorMessage;
} elseif ($fileError !== UPLOAD_ERR_OK) {
    $errorMessage = '文件上传错误！请稍后再试。';
    echo $errorMessage;
} else {
    $fileExtension = pathinfo($fileName, PATHINFO_EXTENSION);
    $newFileName = uniqid() . '.' . $fileExtension;

    move_uploaded_file($fileTmpName, $uploadPath . $newFileName);
    echo '文件上传成功！';
}