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Edit File: admin_prog_edit2.php

<?php
define('DB_SERVER', 'hostingmysql323.register.it');
define('DB_USERNAME', 'gregorio');
define('DB_PASSWORD', 'fontana2015');
define('DB_DATABASE', 'fontanaarchitetti');
$db = mysqli_connect(DB_SERVER,DB_USERNAME,DB_PASSWORD,DB_DATABASE);
session_start();
$user_check=$_SESSION['login_user'];

$ses_sql=mysqli_query($db,"select username from members where username='$user_check' ");

$row=mysqli_fetch_array($ses_sql,MYSQLI_ASSOC);

$login_session=$row['username'];

if(!isset($login_session))
{
header("Location: admin.php");
}
?>
<?php
$host="hostingmysql323.register.it"; // Host name 
$username="gregorio"; // Mysql username 
$password="fontana2015"; // Mysql password 
$db_name="fontanaarchitetti"; // Database name

// Connect to server and select database.
mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");

$catz = $_GET["cat"];
  if($_GET["cat"] === "1") {
	$categoriaT = "prog";
}elseif($_GET["cat"] === "2") {
	$categoriaT = "conc";
}

$result = mysql_query('SELECT * FROM '.$categoriaT.' ORDER BY data DESC');
?>
<html>
<head>

<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="cache-control" content="max-age=0">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="expires" content="Tue, 01 Jan 1980 1:00:00 GMT">
<meta http-equiv="pragma" content="no-cache">
<meta charset="UTF-8">
<title>Fontana Architetti - Amministrazione</title>
<link rel="stylesheet" href="css/style.css" media="screen" type="text/css" />
</head>
<body>
<a href="admin_index.php">
<div id="header">
  <h1> Fontana Architetti - Amministrazione</h1>
</div>
</a>
<div id="sottoheader">
  <div class="back"><a href="admin_index.php?p=1"><img src="img/admin/back.jpg"></a></div>
  <div class="tit">
    <h1> Modifica progetti</h1>
  </div>
  
</div>
<div id="blocco">
  <form name="form1" method="post" action="">
  <?php
$currentDate = false;
echo'<table>
	<tr>
	 <th>Nome</th>
	 <th>Elimina</th>
	 <th>Modifica</th>
	</tr>';

while($rows=mysql_fetch_array($result)){

echo'
	<tr>
    <td>'.$rows["data"].' - '.$rows["titolo_IT"].'</td>
    <td><input name="checkbox[]" type="checkbox" id="checkbox[]" value="'. $rows['id'].'"></td>';
	echo'<td><input name="radio[]" type="radio" id="radio[]" value="'. $rows['id'].'"></td>';
	echo'</tr>';

}

echo'<tr>
	<td></td>
	<td><input name="delete" type="submit" id="delete" value="Elimina progetto"></td>
	<td><input name="edit" type="submit" id="edit" value="Modifica progetto"></td>
</form>';

// Check if delete button active, start this; 
if (isset($_POST['delete'])) {
    $checkbox = $_POST['checkbox'];
    $count = count($checkbox);

$tabar = array('', 'prog', 'conc');

for($i = 0; $i < $count; $i++) {
        $id = (int) $checkbox[$i]; // Parse your value to integer

if ($id > 0) { // and check if it's bigger then 0
            mysql_query("DELETE FROM ".$tabar[$catz]." WHERE id = $id");
        }
    }

// if successful redirect to 
if($result){
echo "<meta http-equiv=\"refresh\" content=\"0;URL=admin_prog_edit.php?cat=$catz\">";
}
}

if (isset($_POST['edit'])) {
    $radio = $_POST['radio'];
    $count = count($radio);

for($i = 0; $i < $count; $i++) {
        $id = (int) $radio[$i]; // Parse your value to integer

if ($id > 0) { // and check if it's bigger then 0
		//echo 'id='.$id.' count='.$count;
      // header("location: admin_staffedit.php");
	  echo "<meta http-equiv=\"refresh\" content=\"0;URL=admin_progedit.php?id=$id&cat=$catz\">";
        }
    }

}

?>
</div>
<?php 
mysql_close();
?>
</body>
</html>

Method: