Question

I need to update an array into mysql table.

this is my array

[cat2] => Array
                (
                    [0] => 34
                    [1] => 48
                    [2] => 49
                    [3] => 46
                )

and I want my output as 34,48,49,46 to move into a table called shops and column called category. This is code I written, $shop[‘cat2’] contains the array i posted above. Please help me. This code is keep only 34 in all fields of column category

foreach ($shop['cat2'] as $k => $v) {
    $query = "UPDATE shops SET categories2=$v";
    mysql_query($query);
    }

Answer 1

In order to apply each of these array elements to one row of your category column, you will need to first fetch the a unique id from the shops table, and loop over it, using that unique identifier value in the update query’s WHERE clause:

We’ll call mysql_fetch_assoc() inside the foreach() loop to pull one row per one array element. This assumes you have a column shops.id which is the unique identifier per shop.

// If `id` is not the unique id per shop, substitute the correct column
$rowids = mysql_query("SELECT id FROM shops ORDER BY id");
if  ($rowids) {
  // Loop over your array, and do one update per array elem
  foreach ($cat2 as $cat) {
     $row = mysql_fetch_assoc($rowids);
     $id = row['id'];
     // Your values are ints, so no need to quote and escape.
     // If you do use other string values, be sure to mysql_real_escape_string() them and single-quote
     $upd = mysql_query("UPDATE shops SET category = $cat WHERE id = $id");
     // Report error on this iteration
     if (!$upd)  {
        echo "error updating $id" . mysql_error();
     }
  }
}
else {
   echo "Couldn't get row ids. " . mysql_error(); 
}