How to upload excel file to mysql in php - php

Question

I am trying to upload an excel file using the HTML input tag, to MySQL database using PHP. But the result is a whole lot of characters in the database. the only time it works correctly is when I create a .csv file with notepad and upload it.
if(isset($_POST['submit_excel'])){
if(!is_uploaded_file($_FILES['file_excel']['tmp_name'])){
echo '<script type="text/javascript">function hideMsg(){
document.getElementById("popup_no_f").style.visibility = "hidden"; } document.getElementById("popup_no_f").style.visibility = "visible";
window.setTimeout("hideMsg()", 4000);
</script>';
} else {
$filename = $_FILES['file_excel']['name'];
$extension = pathinfo($filename, PATHINFO_EXTENSION);
if ($extension == 'xlsx' || $extension == 'csv' || $extension == 'xls') {
if($_FILES['file_excel']["size"] > 0)
{
$handle = fopen($_FILES['file_excel']['tmp_name'], "r");
$count = 0;
while (($data = fgetcsv($handle, 1024, ",")) !== FALSE)
{
$count++;
if ($count>1) {
if (empty(data[0]) && empty(data[1]) && empty(data[2]) && empty(data[3]) && empty(data[4]) ){
echo alert();
}else{
do{
$bookuniqueid = uniqueid();
$query = "SELECT book_unique_id FROM books_tbl WHERE book_unique_id= '$bookuniqueid' ";
$query_run = mysqli_query($link, $query);
$numRowsCheck = mysqli_num_rows($query_run);
} while ( $numRowsCheck > 0);
$import ="INSERT INTO books_tbl (book_name, book_authors, book_category, book_quantity, book_cd, book_unique_id, book_uploaded_admin, book_created_date, book_quant_stat) VALUES ('$data[0]','$data[1]','$data[2]','$data[3]','$data[4]', '$bookuniqueid', '$adminname', current_date, '$data[3]' )";
mysqli_query($link, $import);
}
}
}
fclose($handle);
echo '<script type="text/javascript">function hideMsg(){
document.getElementById("popup").style.visibility = "hidden"; } document.getElementById("popup").style.visibility = "visible";
window.setTimeout("hideMsg()", 4000);
</script>';
}
} else {
echo '<script type="text/javascript">function hideMsg(){
document.getElementById("popup_ext").style.visibility = "hidden"; } document.getElementById("popup_ext").style.visibility = "visible";
window.setTimeout("hideMsg()", 4000);
</script>';
}
}