How to get a variable to increase an increment within an echo

[Darkmatter5]

Here's my code

echo "<tr bgcolor='$fillcolor'>
                          <td>$row[mem_username]</td>
                          <td width='20'><input name='$row[member_id]name' type='text' class='text_boxes' tabindex='$tab' size='20' maxlength='100' /></td>                          
                          <td align='center'><input type='checkbox' tabindex='$tab+1' name='$row[member_id]activated' $act></td>
                          <td align='center'><input type='checkbox' tabindex='$tab+2' name='$row[member_id]priv_admin' $admin></td>
                          <td align='center'><input type='checkbox' tabindex='$tab+3' name='$row[member_id]priv_file' $file></td>
                          <td align='center'><input type='checkbox' tabindex='$tab+4' name='$row[member_id]priv_guest' $guest></td>
                          <td align='center'><input type='checkbox' tabindex='$tab+5' name='$row[member_id]rights_news' $news></td>
                          <td align='center'><input name='delete' type='submit' class='button' tabindex='$tab+6' value='DELETE' /> | <input name='save' type='submit' class='button' tabindex='3' value='SAVE' /></td>
                          </tr>";
                    $tab=$tab+7;

This code is inside a while loop, so instead of existing the echo each time to increase the variable, how can I do this on-the-fly within the echo?

[Mchl]

echo $tab++

 

[.josh]

echo $tab++

 

will not work in an echo.

 

$x = 1;
echo "blah" . $x++ . "moreblah"; // will inc $x but will not echo result
echo "blah" . ($x+1) . "moreblah"; // echoes 2 but does not inc $x
echo "blah" . ($x=$x+1) . "moreblah"; // incs and echoes 2

[Mchl]

echo $tab++

 

will not work in an echo.

 

On what basis you state that?

 

try

 

echo ($i++." ".$i++." ".$i++." ".$i++);

[.josh]

echo comes before ++ in order of operation, so the var will be echoed first, then incremented.  Try your own code. It only echoes 3 vars, because on your first $i++, $i doesn't exist, so it echoes nothing. 

 

<?php
$x = 1;
echo $x++; // output: 1
echo $x; // output: 2
?>

 

Output: 12

[Mchl]

But it still would work for the original code, where $tab was declared before the loop.

And there's also preincrementing available.

 

echo ++$i." ".++$i." ".++$i." ".++$i;

[.josh]

But it still would work for the original code, where $tab was declared before the loop.

And there's also preincrementing available.

 

echo ++$i." ".++$i." ".++$i." ".++$i;

 

You suggested $tab++ this will not work because OP wants the next incremented value to echo. $tab++ will have it "lag behind".  And yes, ++$i will work, but that's not what you suggested, now is it?

[Mchl]

Look at the code OP posted. We can safely assume, that $tab is declared as an integer number somewhere before it, because otherwise

tabindex='$tab'

would echo

tabindex=''

and I doubt it was OP's goal. What's more, $tab has a value of first tabindex to be used in this section of code. So in this case postincrementation would work perfectly well, now wouldn't it?

[.josh]

Ah you are right.  I did not notice the tabindex='$tab' (without the +x) because it wasn't lined up with the rest.  My bad.  So yeah, as long as OP puts $tab++ on the first one, that should work.