Question

I hope my question will be clear and perfect enough to not get down votes – or even the closed status.

I have simple HTML form:

<form ..>
  <input type="hidden" name="user_id" value="1" />

  <input type="text" name="tag[]" value="css" />
  <input type="text" name="tag[]" value="php" />
  <input type="text" name="tag[]" value="sql" />

  ...

  <input type="text" name="email" value="[e-mail]" />

</form> 

MySQL Schema:

 id 
 user_id
 tag 
 .... 

I want to update tag for the user_id = 1, So I write this code:
Note: I have just one user in the table.

$user_id = $_POST['user_id'];
$tag     = mysql_escape_string($_POST['tag']); // $tag is an array - print $tag
$email   = $_POST['email'];

foreach($tag as $value) {
    $DB = "UPDATE table SET tag = '$value' AND email = '$email' 
           WHERE user_id = '$user_id'";
    .... // run the query 
}

I Get:

 id   user_id   tag
 1    1         sql
 2    1         sql
 3    1         sql

Instead of :

 id   user_id   tag
 1    1         css
 2    1         php
 3    1         sql

I ask If I missed something in the PHP code?

Answer 1

In the first update query, you set all records with a user_id of 1 (all 3 of them) to “css”, then “php”, and the finally “sql”. After the foreach loop is finished, they are all “sql”

You could try this:

$i = 1;
foreach($tag as $value) {
    $DB = "UPDATE table SET tag = '$value' WHERE user_id = '$user_id' AND id=$i";
    .... // run the query 
    $i++;
}