Playing around with Modulus Division - php

Question

I'm trying out the modulus division with a foreach loop, and I'm having a bit trouble understanding it.
$counter = 0;
foreach($result as $row){
if(isset($row['username'])){
if (($counter) % 2 == 0){
echo "<tr class=\"r1\"><td class=\"center\">" . $row['username'] . "</td></tr>";
}
else{
echo "<tr class=\"r0\"><td class=\"center\">" . $row['username'] . "</td></tr>";
}
$counter++;
}
}
I want to output:
<tr class="r0">
<td>Bob</td>
<td>Daniel</td>
</tr>
<tr class="r1">
<td>Dylan</td>
<td>Bruce</td>
</tr>
But currently, with my loop, I'm outputting:
<tr class="r1">
<tdBob</td>
</tr>
<tr class="r0">
<td>Daniel</td>
</tr>
<tr class="r1">
<td>Dylan</td>
</tr>
<tr class="r0">
<td>Bruce</td>
</tr>
Can someone explain to me exactly how modulus division works? Thank you.

Answer 1

Here, you want to display two records in one row. Actually modulus division will return the remainder of the division. Try with:
$counter = 0;
$i=1;
foreach($result as $row){
if(isset($row['username'])){
if (($counter) % 2 == 0){ // that is the counter value/2 doesnot returns a remainder ie, divisible by 2, then create another row
if($i%2==0)
{
echo "<tr class=\"r1\">";
}
else
{
echo "<tr class=\"r0\">";
}
}
else{
echo "<td class=\"center\">" . $row['username'] . "</td>";
}
if (($counter) % 2 == 0){ // close the tr if the counter doesnot return remainder
echo "</tr>";
}
$counter++;
$i++;
}
}

Answer 2

I got this to work. My problem was that my array was multidimensional, so I converted it to a single array. Afterwards, I used array_chunks.
$chunks = array_chunk($l, 2);
$i=0;
foreach($chunks as $mychunk){
if($i%2== 0){
echo "<tr class=\"r0\">";
} else { echo "<tr class=\"r1\">"; }
$i++;
foreach($mychunk as $newchunk)
{
echo "<td class=\"center\">" . $newchunk . "</td>";
}
echo "</tr>";
}
For anyone looking to convert multidimensional arrays into single dimensional array:
function array_flatten($array) {
if (!is_array($array)) {
return FALSE;
}
$result = array();
foreach ($array as $key => $value) {
if (is_array($value)) {
$result = array_merge($result, array_flatten($value));
}
else {
$result[$key] = $value;
}
}
return $result;
}