上传错误的文件类型PHP时无法获得echo错误

Question

I'm trying to make it so that when the user uploads any document that isn't a csv file an echo error appears. However when I tested it I got the echo error on both the correct file type and an incorrect file type. Anyone know where I'm going wrong?

<?php
    ob_clean();session_start();

    if (isset($_GET['logout'])){
    session_destroy();  
    }

    if (!isset($_SESSION['loggedin']) || $_SESSION['loggedin'] == false) {
        header("Location: index.php");
    }

    if(isset($_FILES['UploadFileField'])){
    $allowed = array('csv');
    $UploadName = $_FILES['UploadFileField']['name'];
    $UploadTmp = $_FILES['UploadFileField']['tmp_name'];
    $UploadType = $_FILES['UploadFileField']['type'];
    $NewFileName = "project1file.txt";


    if(!$UploadTmp){
        echo '<font color="#FF0000" size="3"><p align="center"><b>No File Selected, Please Try Again.</b></p></font>';
    }else{
        move_uploaded_file($UploadTmp, "UPLOADS/$NewFileName");
        echo '<font color="#006600" size="3"><p align="center"><b>File Successfully Uploaded.</b></p></font>';

    }

    if(!in_array($UploadTmp,$allowed) ) {
    echo 'error';
}

}

?>

Answer 1

Use the below code to find the extension of the uploaded file:

$type = $_FILES["UploadFileField"]["type"];

And then echo

if(!in_array($type,$allowed) ) {
    echo 'error';
}

Update 1:

$mimes = array('application/vnd.ms-excel','text/plain','text/csv','text/tsv');

if(in_array($_FILES['UploadFileField']['type'],$mimes)){
  // do something
} else {
  die("Sorry, mime type not allowed");
}

Update 2:

You can use this as well, actually $_FILES...['type'] is not safe to use.

$types = array('csv');

$ext = pathinfo($UploadName, PATHINFO_EXTENSION);


if(in_array($ext,$types)){
// do something
} else {
    die("Sorry, only CSV type allowed");
}