Generate HTML Table Header From Multi Dimensional Array Dynamically

My requirement is to generate HTML table header with Dynamic multi dimensional array. e.g. Array will be like, $Array = ('Sr.No.'=>'', 'Subject'=>array('Maths','Sci','History

Solution 1:

Here you go:

$headers = "<thead>";
foreach ($Array as $key => $value)
{
    $headers .= "<th colspan='".max(sizeOf($Array[$key]),1)."'>".$key."</th>";
}
$headers .= "</thead>";

Here is a working DEMO

EDIT- BASED ON COMMENTS:
The demo above have the following code:

$Array = array("Sr.No." => "",'Subject'=>array('Maths','Sci','History','Social Sci'),  
              'Other Activities'=>array('Sports','Computer','Social'));

$table = "<table style='border-style: solid;'><thead>";
$headers = "<tr>";
$headers2 = $headers;
foreach ($Array as $key => $value)
{
  $headers .= "<th colspan='".max(sizeOf($Array[$key]),1)."' style='border-right: 1px solid;'>".$key."</th>";
 if(is_array($Array[$key]))
 {
     foreach ($Array[$key] as $key2 => $value2)
     {
         $headers2 .= "<th style='border: 1px dotted;'>".$value2."</th>";
     }
 }
 else{$headers2 .= "<th style='border:1px dotted;'></th>";}
}
$headers .= "</tr>";
$headers2 .= "</tr>";
$table .= $headers.$headers2."</thead></table>";

echo $table;  

Here are the results: