How to Not display empty rows? - php

Question

My question is:
If you look at where it would display "
<td>1ST<?php echo $first ?></td>
"
How do I ensure that if the row associate to variable '$first' or all the others if they are empty nothing shows. Also that the '1st' doesn't show?
Have tried various things I am stumped on this!
<h2><?php echo $show_title ?></h2>
<h4>Show Date: <span class="glyphicon glyphicon-time"> </span><?php echo $show_date ?></h4>
<hr>
</a>
<hr>
<?php
// SO UPDATE THE QUERY TO ONLY PULL THAT SHOW'S DOGS
$query = "SELECT * FROM result
WHERE first IS NOT NULL";
$result = mysqli_query($connection, $query) or trigger_error
("Query Failed! SQL: $query - Error: ". mysqli_error
($connection), E_USER_ERROR);
if ($result) {
while ($row = mysqli_fetch_assoc($result)) {
$dog_name = $row['dog_name'];
$placement = $row['placement'];
$class_name = $row['class_name'];
$entries = $row['entries'];
$absentee = $row['absentee'];
$entries = $row['entries'];
$first = $row['first'];
$second = $row['second'];
$third = $row['third'];
$RES = $row['RES'];
$VHC = $row['VHC'];
$DCC = $row['DCC'];
$RDCC = $row['RDCC'];
$BCC = $row['BCC'];
$RBCC = $row['RBCC'];
$BOB = $row['BOB'];
$BP = $row['BP'];
$BJ = $row['BJ'];
?>
<table class="table" border="0"></div>
<tr>
<td><strong><?php echo $class_name ?></strong> - <h6>Entries: <?php echo $entries ?> Absentees: <?php echo $absentee ?></h6></td>
<td></td>
</tr>
<tr>
<td>DCC</td>
<td><?php echo $DCC ?></td>
</tr>
<tr>
<td>RDCC</td>
<td><?php echo $RDCC ?></td>
</tr>
<tr>
<td>BCC</td>
<td><?php echo $BCC ?></td>
</tr>
<tr>
<td>RBCC</td>
<td><?php echo $RBCC ?></td>
</tr>
<tr>
<td>BOB</td>
<td><?php echo $BOB ?></td>
</tr>
<tr>
<td>BP</td>
<td><?php echo $BP ?></td>
</tr>
<tr>
<td>BJ</td>
<td><?php echo $BJ ?></td>
</tr>
<tr>
<td>1ST</td>
<td><?php echo $first ?></td>
</tr>
<tr>
<td>2ND</td>
<td><?php echo $second ?></td>
</tr>
<tr>
<td>3RD</td>
<td><?php echo $third ?></td>
</tr>
<tr>
<td>RES</td>
<td><?php echo $RES ?></td>
</tr>
<tr>
<td>VHC</td>
<td><?php echo $VHC ?></td>
</tr>
</table>

Answer 1

You're doing well, just apply a filtering function to each row you recieve:
// SO UPDATE THE QUERY TO ONLY PULL THAT SHOW'S DOGS
$query = "SELECT * FROM result
WHERE first IS NOT NULL";
$result = mysqli_query($connection, $query);
if (!$result) {
trigger_error("Query Failed! SQL: $query - Error: ". mysqli_error($connection), E_USER_ERROR);
} else {
// Fetch results into array
$data = mysqli_fetch_all($result, MYSQLI_ASSOC);
// If results array is not empty
if ($data) {
echo '<table class="table" border="0"></div>
<tr>
<td>
<strong><?php echo $class_name ?></strong> - <h6>Entries: <?php echo $entries ?> Absentees: <?php echo $absentee ?></h6>
</td>
<td></td>
</tr>';
// Now let's walk through every record
array_walk($data, function($dogRecord) {
// Here we apply array_filter to each dog record, so that empty values (i.e. those evaluating to false) are filtered out
$dogRecord = array_filter($dogRecord);
// Now loop throw $dogRecord to build table
$collation = [
'DCC' => 'DCC',
'RDCC' => 'RDCC',
'BCC' => 'BCC',
'RBCC' => 'RBCC',
'BOB' => 'BOB',
'BP' => 'BOB',
'BJ' => 'BOB',
'1ST' => 'first',
'2ND' => 'second',
'3RD' => 'third',
'RES' => 'RES',
'VHC' => 'RES'
];
foreach ($dogRecord as $property => $value) {
echo '<tr>
<td>'.$collation[$property].'</td>
<td>'.$value.'</td>
</tr>';
}
});
echo '</table>';
}
}
Note that instead of simple foreach loop I'm using array_walk function. This is because since you extract variables for each record, you want undeclared (i.e. unoccupied) varables every time.

Answer 2

What about this:
if(mysqli_num_rows($result) > 0){
while($row = mysqli_fetch_assoc($result)){
// Show the table-row
}
}

Answer 3

The following code will iterate through each row in the result (while loop) and each key => value within each row (foreach loop); it will then check if a value is not null or the key is not equal to 'first' (if statement) and echo the results in the table element. I'm not sure I fully understood your question but I hope this helps in some small way.
<table>
<?php
if($result){
while($row = mysqli_fetch_assoc($result))
foreach($row as $key => $value){
if($value != null && $key != 'first'){
echo '<tr>';
echo '<td>' . $key . '</td>';
echo '<td>' . $value . '</td>';
echo '</tr>';
}
}
}
?>
</table>