How to deal with arrays in PHP language - php

Question

<?php
$con = mysqli_connect('localhost', 'root', '');
if(!$con)
{
die("not ok");
}
mysqli_select_db($con,"uoh");
$q1 = "SELECT * FROM student_record INNER JOIN degree_plan ON
student_record.course_number = degree_plan.course_number
INNER JOIN courses ON student_record.course_number =
courses.course_number where student_record.id = 201102887 AND degree_plan.major='COE'";
$result = mysqli_query($con , $q1 ) ;
$data = array();
while($row = mysqli_fetch_array($result))
{
$data[$row["term_no"]][] = array(
'code' => $row["code"],
'grade' => $row["grade"]
);
}
echo '<table width="200" border="1">';
echo "<tr>";
echo "<th>courses</th>";
echo "<th>terms</th>";
echo "<th>grades</th>";
echo "</tr>";
foreach($data as $term=>$otherrow) {
$count = 0;
foreach ($otherrow as $data) {
if($count == 0) {
echo "<tr>";
echo "<td>" . $data["code"]. "</td>";
echo '<td rowspan="'.count($otherrow).'">' . $term. '</td>';
echo "<td>" . $data["grade"]. "</td>";
echo "</tr>";
}
else
{
echo "<tr>";
echo "<td>" . $data["code"]. "</td>";
echo "<td>" . $data["grade"]. "</td>";
echo "</tr>";
}
$count++;
}
}
echo "</table>";
?>
I have this code and it work very well but I faced problem when I want to add more column .
I tried to add fourth column(echo "<td>" . $row["crd"]. "</td>"; ) but there is no result .It give me empty cells. how I can do that?
I want add add this echo "<td>" . $row["crd"]. "</td>"; column to my code.

Answer 1

As mentioned in the comments, there are two errors that have been noticed.
You are re-declaring $data in your second foreach loop
You don't have $row initiated anywhere, and atempting to echo $row["crd"] will result in an empty cell.
Proposed Solution:
Change the name of the $data value in the foreach loop to $row and hence solve both problems at the same time:
foreach($data as $term=>$otherrow) {
$count = 0;
foreach ($otherrow as $row) {
if($count == 0) {
echo "<tr>";
echo "<td>" . $row["code"]. "</td>";
echo '<td rowspan="'.count($otherrow).'">' . $term. '</td>';
echo "<td>" . $row["grade"]. "</td>";
echo "</tr>";
}
else
{
echo "<tr>";
echo "<td>" . $row["code"]. "</td>";
echo "<td>" . $row["grade"]. "</td>";
echo "</tr>";
}
$count++;
}
}
And when you add echo "<td>" . $row["crd"]. "</td>"; now it should echo the value stored in the $row array (as long as the value was extracted from the table in the database in the first place of course).
Let me know if this worked for you.