Failed to get paging get value

Click the page number to jump to a page where the page is blank.
when the normal page number is 1, the image is as follows:

2:

</a></td>        
        </tr>
        </tbody>
        </table>

<?php
}
?>    
    
<?php
    
    if($page>1){
        echo "<a href="?page=1"></a>";
        echo "<a href="?page=".($page-1).""></a>";
    }
    if($page<$countpage)
    {
        echo "<a href="?page=".($page+1).""></a>";
        echo "<a href="?page=".$countpage.""></a>";
    }     



    
    }
    
}




?>
Php
Mar.13,2021

because $_ SERVER ['REQUEST_METHOD']! =' POST'

does anyone else know about this problem?

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