Loop through multiple arrays and list the result dynamically - php

Question

I'm struggeling with this one. How can list all devices, their model and supplier from my database? The data is stored comma-separated in the fields device, model and supplier.
<?php
while ($row = mysqli_fetch_array($result)) {
$device_explode = explode(',', $row['device']);
$model_explode = explode(',', $row['model']);
$supplier_explode = explode(',', $row['supplier']);
$device = array(array($device_explode[0]), //count function? How would I do that?
array($model_explode[0]),
array($supplier_explode[0])
);
echo "<table border='1'>
<tr>
<th>Møterom</th>
<th>Romnummer</th>
<th>Lokasjon</th>
<th>Antall sitteplasser</th>
<th>Tilgjengelig utstyr</th>
<th>Bilde av rommet</th>
<th>Endre</th>
<th>Slett</th>
</tr>
<tr>
<td>".$row['name']."</td>
<td>".$row['roomnbr']."</td>
<td>".$row['location']."</td>
<td>".$row['seats']."</td>
<td>".$device[0][0]."<br>".$device[1][0]."<br>".$device[2][0]."<br></td> //also count?
<td><img src='../img/uploads/".$row['img']."' width='150px' ></td>
<td><a href='?p=editconfroomv2&id=".$row['id']."'>Endre</a></td>
<td><a href='./index.php?p=deleteconfroomdb&id=".$row['id']."' class='delete'>Slett</a></td>
</tr>
</table>";
}
?>

Answer 1

It can be done this way (if I understand correct your table structure). I assume, that $device_explode, $model_explode and $supplier_explode have equal number of elements:
<?php
// Table Header
echo "<table border='1'>
<tr>
<th>Møterom</th>
<th>Romnummer</th>
<th>Lokasjon</th>
<th>Antall sitteplasser</th>
<th>Tilgjengelig utstyr</th>
<th>Bilde av rommet</th>
<th>Endre</th>
<th>Slett</th>
</tr>";
while ($row = mysqli_fetch_array($result)) {
$device_explode = explode(',', $row['device']);
$model_explode = explode(',', $row['model']);
$supplier_explode = explode(',', $row['supplier']);
// Table rows
$td = '';
$td .=
"<tr>
<td>".$row['name']."</td>
<td>".$row['roomnbr']."</td>
<td>".$row['location']."</td>
<td>".$row['seats']."</td>
<td>";
for ($i = 0; $i < count($device_explode); $i++) {
$td .=$device_explode[$i]." ".$model_explode[$i]." ".$supplier_explode[$i]."<br>";
}
$td .=
"</td>
<td><img src='../img/uploads/".$row['img']."' width='150px' ></td>
<td><a href='?p=editconfroomv2&id=".$row['id']."'>Endre</a></td>
<td><a href='./index.php?p=deleteconfroomdb&id=".$row['id']."' class='delete'>Slett</a></td>
</tr>";
echo $td;
}
echo "</table>";
?>

Answer 2

I would suggest looping trough the arrays in the markup and generating the output using the html templating syntax and alternative control structures.
Some things i have done[not related directly to the question]:
switched the array() syntax for the shorthand [can be done since version 5.4]
switched from using a single echo to utilizing the html templating syntax [by expluding non dynamic parts from php and echoing the dynamic parts in]
Switched from using the echo statement to using the shorthand
Switched to alternative control structures
PHP documentation for strings
<?php
while ($row = mysqli_fetch_array($result)) {
$device_explode = explode(',', $row['device']);
$model_explode = explode(',', $row['model']);
$supplier_explode = explode(',', $row['supplier']);
//I am assuming you want to loop trough all exploded fields related to each row
$devices = [
$device_explode,
$model_explode,
$supplier_explode
];
?>
<?php while(($row = mysqli_fetch_array($result))) : ?>
<table border='1'>
<tr>
<th>Møterom</th>
<th>Romnummer</th>
<th>Lokasjon</th>
<th>Antall sitteplasser</th>
<th>Tilgjengelig utstyr</th>
<th>Bilde av rommet</th>
<th>Endre</th>
<th>Slett</th>
</tr>
<tr>
<td><?= $row['name'] ?></td>
<td><?= $row['roomnbr'] ?></td>
<td><?= $row['location'] ?></td>
<td><?= $row['seats'] ?></td>
<td>
<?php foreach ($devices as $deviceSpecs) : //Here we loop trough the first dimension fo the array ?>
<?php foreach ($deviceSpecs as $deviceSpec): //Here we loop trough the second dimension ?>
<?= $deviceSpec ?><br>
<?php endforeach; ?>
<?php endforeach; ?>
</td>
<td><img src='../img/uploads/<?= $row['img'] ?>' width='150px' ></td>
<td><a href='?p=editconfroomv2&id=<?= $row['id'] ?>>Endre</a></td>
<td><a href='./index.php?p=deleteconfroomdb&id=<?= $row['id'] ?>' class='delete'>Slett</a></td>
</tr>
</table>
<?php endwhile; ?>