Passing form information in a for-loop - php

Question

Maybe this is a stupid question, but I was wondering if I could get information passed with a form into a for-loop.
The problem is as follows:
The passing of the information works, though he passes only for the last loop. For example if I click the submit button for loop 2 ($i = 2). The command $_POST['titel'] will only remember the information in last loop ($i = $numact-1) and not loop 2 ($i = 2).
for example if titel[0] = test0, titel[1] = test1, titel[2] = test2. and I click the submit button below titel[0] he passes the information from titel[2]. Is there an easy way to get around this?
I have the following code (For the sake of simplicity I shortened it);
<?php
for ($i = 0; $i <= $numact-1; $i++) {
echo "<tr><td width='150'>
<input type='text' name='titel' value='$titel[$i]' />
</td></tr>
<tr><td><input type='submit' name='submitreg' value='Toon activiteit'/>
</td></tr>";
}
?>

Answer 1

You're using the same parameter name over and over again (name=titel - you had a type and probably meant to write as 'title') so when the form submits - only one value will be passed.
You can easily fix that by passing the parameters as:
...
echo "<tr><td width='150'>
<input type='text' name='titel$i' value='$titel[$i]' />
</td></tr>
<tr><td><input type='submit' name='submitreg' value='Toon activiteit'/>
</td></tr>";
...
and reading it on the other side as title0, title1 etc.

Answer 2

As seen in this post, you can pass in an array simply by putting brackets around the index. PHP will reconstruct the array for you.
Also, you probably want your submit at the end of your table, not after each row. Your code should look something like this:
<?php
for ($i = 0; $i <= $numact-1; $i++) {
echo "<tr><td width='150'>
<input type='text' name='titel['.$i.']' value='$titel[$i]' />
</td></tr><tr><td><input type='submit' name='submitreg' value='Toon activiteit'/>
</td></tr>";
}
?>
The advantage of this approach is that it's more extensible, should you choose to use different values. However, Edson Junior's approach is slightly simpler.

Answer 3

You can change the name attribute to name=titel[] so PHP will automatically transform it to an array. It is not necessary to specify the index inside title[].
For example:
<input type="text" name="titel[]" value="x" />
<input type="text" name="titel[]" value="y" />
<input type="text" name="titel[]" value="z" />
When you submit the form, PHP will transform it to
"title" = array (
0 => "x",
1 => "y",
2 => "z"
);
In case you need to check what button was clicked, you could change the inputs type="submit" to <input type="button" name="submitreg" class="submitreg" id="whatever_you_want_but_has_to_be_unique" />.
Outside the loop, add another input wich will have the value of what button was pressed.
<input type="hidden" id="buttonPressed" name="buttonPressed" value="" />
Then add this code (you need to import jQuery library to the page so it understands the code below, wich is jQuery, here is the Docs.
<script type="text/javascript">
$(function(){
$("button.submitreg").live("click", function(){
var buttonPressed = $(this).attr("id");
("input#buttonPressed").val(buttonPressed);
});
}
</script>
All you need to do is get the buttonPressed value and you'll know what button was pressed.