PHP文件上传脚本不会上传jpeg？

Question

我有一个上传的脚本我借了几个位，回声被注释掉，因为最终的输出是pdf。

我有两个问题，第一个是重要问题，为什么不允许我上传.jpeg？我可以上传.png和.jpg吗？！

$target_dir = "../uploads/";
$target_file = $target_dir . basename($_FILES["brakeTestPic"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["brakeTestPic"]["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["brakeTestPic"]["size"] > 5000000000000000) {
    //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 {
    $temp = explode(".", $_FILES["brakeTestPic"]["name"]);
    $newfilename = round(microtime(true)) .'1'. '.' . end($temp);
    move_uploaded_file($_FILES["brakeTestPic"]["tmp_name"], $target_dir . 
    $newfilename);
    $braketestpiclocation = $target_dir . $newfilename;
};

编辑 - 我删除了第二个重复的问题..