我无法将一些值从html复选框数组传递到我的php页面？

Question

I created the product management system that use HTML+PHP+SQL+JS.But it's have a problem some value can't pass to php page to SQL query.I can't find any bug in my code because some data can do that normally. my system use the checkbox array to choose each product that i want to do with them

echo "<td><input type=\"checkbox\" name=\"ProductKey[]\" value=\"".$Key."\"/></td>";

and pass them to any target by javascript like this

<input type='button' id='edit' onclick="OnButtonEdit();" class = "btn btn-success" value='add'></br></br>
<input type='button' id='delete' onclick="OnButtonDelete();" class = "btn btn-warning" value='subtract'></br></br>
<input type='button' id='delete' onclick="OnButtonRemove();" class = "btn btn-danger" value='remove'></br></br>
<input type='button' id='delete' onclick="OnButtonProductbackquery();" class = "btn btn-info" value='pass back to homestock'></br>

in php page that receive value to sql query

foreach ($_POST['ProductKey'] as $Key){
....
}

The Example data that can pass

ProductKey | Size | Colour | Price | Cost | Quantity | Customer | ProductKey | AccountKey
DK9973 | 42 | Black | 550 | 280 |1 | ram35 | 57872 | 128

Example data that can't pass

ProductKey | Size | Colour | Price | Cost | Quantity | Customer | ProductKey | AccountKey
A056 | 40 | Brown | 350 | 220 |1 | ram35 | 58784 | 133

some javascript button function

 function OnButtonDelete() {
    document.myform.action = "delete.php";
    document.myform.target = "_self";
    document.myform.submit();
    return true;  
  }

Thanks for all answer ,If you want more code please tell me :)

Answer 1

If your checkbox is not checked, it will not exist in the php page who receive the post data.

Just test :

if(isset($_POST['ProductKey'])){
  //Checkbox checked
} else {
  //Checkbox not checked
}

Answer 2

Now, I solved it!! it should be the html checkbox maximum in one form. I tried to make the search input that query from ProductID it make the number of checkbox in one form decrease but,now it work for all product.

I don't sure about this solution,but it's work.