How to Get Values of Multiple Selected (Dynamic) Checkbox in PHP

How to get values of multiple selected (dynamic) checkbox in php?

Use checkbox name as an array,
example :

<form method="post" action="" id="frm_id">
        <input type="checkbox" name="chkid[]" value="10,Anu" />Anu
        <input type="checkbox" name="chkid[]" value="11,Raj" />Raj
        <input type="checkbox" name="chkid[]" value="12,Ram" />Ram
        <input type="checkbox" name="chkid[]" value="13,xxx" />xxx
        <input type="checkbox" name="chkid[]" value="14,yyy" />yyyy
        <input type="checkbox" name="chkid[]" value="15,zzz" />zzz
        <input type="checkbox" name="chkid[]" value="16,qqqq" />qqqq
        <input type="submit" value="Insert"  name="sub"/>
        </form>
        <?php
        if(isset($_POST['sub']))
        {
        $id=$_POST['chkid'];
        for($i=0;$i<count($id);$i++)
        {
        $exp=explode(',',$id[$i]);//Explode id and name
        echo 'id='.$exp[0].',Name='.$exp[1];echo "<br>";
        echo $query="INSERT INTO tbl_student (id,name) values ('$exp[0]','$exp[1]')";echo "<br><br>";
        }
        }
        ?>

Post dynamic checkbox ids with values

I don't know why you need this but in your case I would do this:

while($row = mysqli_fetch_array($result)) {?>
    <br><input type="checkbox" name="categories_chk[<?= $row["cat_id"]; ?>]" value="<?= $row["cat_name"]; ?>"> <?= $row["cat_name"]; ?>
<?php
}

See, I set index of categories_chk as a category id.

If you print_r($_POST['categories_chk']) you will have a key=>value array where key is category id and value is it's name.

You can iterate over it kinda:

foreach ($_POST['categories_chk'] as $id => $name) {
    echo 'Category id ' . $id . ' with name ' . $name;
}

Of course, I need to mention that $row["cat_id"] must be unique for such approach, otherwise you will have two same keys in array and the latter overwrites the previous one.

SelectAll checkbox for the dynamic checkbox inputs

try this

 <?php
  $i=0;
  while($data = mysql_fetch_array($subject)) {
 echo "<input type='checkbox' id='{$i}' class='check'>"."CheckAll" ;
  echo "<input type='checkbox' class='check_{$i}' value='{$data['OrderID']}'>" .     $data['OrderID'] ;
  echo "<input type='checkbox'  class='check_{$i}' value='{$data['ProductID']}'>" .     $data['ProductID'] ;  
  echo "<input type='checkbox'  class='check_{$i}' value='{$data['UnitPrice']}'>" . $data['UnitPrice'] ;  
  echo "<input type='checkbox'  class='check_{$i}' value='{$data['Quantity']}'>" . $data['Quantity'] . '</br>'; 
$i++;
}

?>

 </form>
 <script>
    $('.check').click(function(e){
      var id=$(this).attr('id');
      $('.check_'+id).prop('checked',this.checked);
    });
 </script>

How to get values of dynamic Unchecked checkboxes in post PHP

How i said in the comment you can use array_diff for select only the value isn't selected :

$dbarray = array('1','2','3','4');
$selectedarray = array('1','3');
$substract = array_diff($dbarray, $selectedarray);
print_r($substract); //print 2,4

Submitting a dynamic checkbox form and get values in pairs

From the discussion, to me it seems better to send the checkbox in key=>value

<input type="checkbox" name="valg[<?=$hent_data[id]?>]" value="<?=$hent_data[process_id]?>" />

This will give you a result in the php side similar to

Array
(
    [valg] => Array
        (
            [uniqueKey3] => processID3
            [uniqueKey7] => processID7
            [uniqueKey8] => processID8
        )

)

Therefore in the php you can do this:

foreach($_POST['valg'] as $ID => $processID){
    echo $hest = "INSERT INTO chosen (kat_ref, prod_ref, process_id) VALUES ($ID, '', $processID)"."<br/>";
}

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