PHP - obtener datos en un array

<form name="consulta1" method="post" action="ejecuta4.php">

<table>

<tr>

</td><td align="center" ><input type="text" name="1_1" id="1_1"  value="10" ><br>

</td><td align="center" ><input type="text" name="1_2" id="1_2" value="7.0" ><br>

</td><td align="center" ><input type="text" name="1_3" id="1_3"  value="9.0" ><br>

</td><td align="center" ><input type="text" name="1_4" id="1_4"  value="10" ><br>

</tr>

<tr>

</td><td align="center" ><input type="text" name="2_1" id="1_1"  value="8" ><br>

</td><td align="center" ><input type="text" name="2_2" id="1_2" value="4" ><br>

</td><td align="center" ><input type="text" name="2_3" id="1_3"  value="5" ><br>

</td><td align="center" ><input type="text" name="2_4" id="1_4"  value="10" ><br>

</tr>

</form>

<button> Go</button>

<?php

$mipost=$_POST;

var_dump($mipost);

<?php

$mipost=$_POST;

?>

<table width=”100%” border=”1″>

 <?php

       foreach($mipost as $key => $value)

          {

 ?>

        <tr>

               <td>

                   <?php echo $key; ?>

             </td>

                     <?php foreach($value as $key=>$value)

                       {

                     ?>

              <td>

                    <?php echo $value;?>

             </td>

                    <?php

                     }

                    ?>

        </tr>

        <?php

        }

       ?>

</table>

<?php

$tabla=$_POST;

$i=1;

foreach ($tabla as $key =>$value){

    echo $value;

    echo ($i%4==0)?"</br>":" --- ";

    $i++;

}