How can I get the sender ID of dynamically created submit buttons? - php

Question

I'm generating a html table. Each row starts with a Edit-Button.
Site A:
echo "<table border='1' align='center'>";
echo "<tr>"
. "<th style='font-weight:bold'></th>"
. "<th>".$nr.":</th>"
. "<th>Anschrift</th><th>Nachname</th>"
. "<th>Vorname</th>"
. " <th>PLZ</th>"
. "<th>Ort</th>"
. "</tr>";
echo "<form action='lxKundenEdit.php' method='POST'>";
$i=0;
foreach($arr as $key =>$value)
{
echo "<tr><td><input type='submit' name='btn'.$i.'\'' value='Bearbeiten'/></td>";
foreach($value as $subkey=>$subValue)
{
echo "<td>".$subValue."</td>";
}
echo "</tr>";
$i++;
}
echo "</form>";
echo "</table>";
Then I want to know which button has been pushed. When vardump the POST-Array it seems nothing really works. Any hints about this? regards, Ismir
Site B:
var_dump($_POST['btn0']); //f.e.

Answer 1

Simply pass the sender ID in a hidden input
<input type="hidden" name="sender" value="<?= $senderID; ?>">
On Site B you can then get the value from the $_POST variable:
echo $_POST['sender'];
Edit
I see I misread your question. What you can do is pass your subkey on the submit button as follows:
<input type="submit" name="submit[<?= $subkey; ?>]" value="send" />

Answer 2

You should give each button a unique value. When the form is posted you can then check for that value for that button.
echo '<input type="submit" name="btn'.$i.'" value="'.$i.'" />';
Edit:
As Peter pointed out in the comments, if you want to change the text of your button, you can use the button element:
<?php
echo '<form method="post">';
echo '<button type="submit" value="button 1 was used" name="button">Send</button>';
echo '<button type="submit" value="button 2 was used" name="button">Send</button>';
echo '</form>';
var_dump( $_POST[ 'button' ] );

Answer 3

All you need to do is:
Make array of all your submit buttons with ids as keys.
echo '<tr><td><input type="submit" name="btn[<?php echo $i;?>]" value="Bearbeiten"/></td>';
And then in PHP, get posted submit buttons like:
if (! empty($_POST['btn']) {
foreach ($_POST['btn'] as $btnId => $btnVal) {
// $btnId is Id of the button that is $i
// $btnId means button is pressed.
// $btnVal is value of the button
}
}

Answer 4

Just include a hidden input inside your form, eg
<input type='hidden' name='submit'/>
So you can use it to check, if the form has been sent (if(isset($_POST['submit'])) etc). Then check any other $_POST fields looking for any ['btn...'], eg
foreach($_POST as $key => $value){ // check all the $_POST fields
if(substr($key,0,3) == 'btn'){ // if its name begins with 'btn'...
$button_id = substr($key,3,NULL); // then that's some button. Get its ID
}
}
Think this should work