Get checkbox value in php

i have a php file that have some ckeckboxes in table, that are 'checked' or 'unchecked' by database value at the time of form load.
now i want 'check' or 'uncheck' the checkboxes and click a save link that update new 'checked' or 'unchecked' values in database.
i have save link for each database record in HTML table.
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:

1. Named your checkboxes with something like: chk[]
2. on your php scripts:


$query = "Delete from yourtable Where id = ".$id;
            $result = mysql_query($query); // or die("Query failed : " . mysql_error());
            //re-insert items checked
            foreach($_POST['chk'] as $chk) {
                  $query = "Insert into yourtable (id, chk_id) Values ($id,$chk) ";
                  $result = mysql_query($query) or die("Query failed : " . mysql_error());


get the idea? try customize accordingly.

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Ray PaseurCommented:
Note that unchecked checkboxes do not come through in your $_POST variable.  At all.

So if you have a checkbox in the data base that is checked, and you put up a form on the screen that shows it checked, and the client un-checks it, you will not have anything for that checkbox in $_POST.

Experiment with the code snippet and you'll see the effect.

HTH, ~Ray
<?php // RAY_checkboxes.php
if (!empty($_POST["_submit"])) {
   echo "<pre>"; var_dump($_POST); echo "</pre> \n";
<form action="<?=$PHP_SELF?>" method="POST">
Check or Uncheck Some Boxes Here<br/>
<input name=box1 type="checkbox"><br/>
<input name=box2 type="checkbox"><br/>
<input name=box3 type="checkbox"><br/>
<input name=box4 type="checkbox"><br/>
<br />
<input type="submit" name="_submit"  value="go" />

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