PHP While loop only fetching first row results - php

Question

i am fetching data from db in datatable , but my while loop is only fetching first row results . i can guess that i am wrong somewhere but not exactly know where . find below the details
Tables :
user :
user_id | user_role_id | user_name | fname | lname | profile
:-----: | :----------: | :-------: | :---: | :---: | :-----:
1 | 2 | schin | sam | chin | t1.png
2 | 2 | mlouis | mark | louis| t2.png
teachers :
t_id | classes | subjects | pri_classes | primary_subjects | email
:-----: | :----------: | :-------: | :---------: | :--------------: | :-----:
1 | eight,nine | math,phy | nine | maths | 1#gmail.com
2 | two | science | two | science | 2#gmail.com
Php Query :
<?php
$sql3 = "select * from user where user_role_id = 2";
$result3 = $dbh->query($sql3);
$row3 = mysqli_fetch_assoc($result3);
$user_id = $row3['user_id'];
$sql4 = "select * from teachers where t_id = '$user_id'";
$result4 = $dbh->query($sql4);
?>
Table head :
<table id="datatable-table" class="table table-striped table-hover">
<thead>
<tr>
<th>S.no</th>
<th class="no-sort hidden-sm-down">Image</th>
<th >Name</th>
<th >User Name</th>
<th >Classes Handled</th>
<th >Subjects Handled</th>
<th >Primary Class</th>
<th >Primary Subjects</th>
<th >Email</th>
</tr>
</thead>
<tbody>
While loop :
<?php
while(($row4 = mysqli_fetch_assoc($result4))&&($row3)){
?>
<tr align="center">
<td>
<?php
$i = 1;
echo $i;
$i++;
?>
</td>
<td>
<span >
<img src="../img/<?php echo $row3['profile'];?>" style="width:40px; height:40px;">
</span>
</td>
<td>
<span class="fw-semi-bold">
<?php echo $row3['fname'].' '.$row3['lname']; ?>
</span>
</td>
<td>
<span class="fw-semi-bold">
<?php echo $row3['user_name']; ?>
</span>
</td>
<td><span class="fw-semi-bold">
<?php
$classes=explode(',', $row4['classes']);
$prefix = '';
foreach($classes as $cout)
{
echo $prefix . '' . wordsToNumber($cout);
$prefix = ', ';
}
?>
</span>
</td>
<td><span class="fw-semi-bold">
<?php
$subjects=explode(',', $row4['subjects']);
$prefix = '';
foreach($subjects as $sout) {
echo $prefix . '' . str_replace('\' ', '\'', ucwords(str_replace('\'', '\' ', strtolower($sout))));
$prefix = ', ';
}
?>
</span>
</td>
<td>
<span class="fw-semi-bold">
<?php
echo wordsToNumber($row4['pri_classes']);
?>
</span></td>
<td><span class="fw-semi-bold">
<?php
echo str_replace('\' ', '\'', ucwords(str_replace('\'', '\' ', strtolower($row4['primary_subjects']))));
?>
</span></td>
<td><span class="fw-semi-bold"><?php echo wordwrap($row4['email'],10, "<br>\n"); ?></span></td>
</tr>
<?php
}
?>
</tbody>
</table>
For wordsToNumber i use this function

Answer 1

Your first query is only retrieving a single user. You need nested loops.
while ($row3 = mysqli_fetch_assoc($result3)) {
$user_id = $row3['user_id'];
$result4 = $dbh->query("select * from teachers where t_id = '$user_id'");
while($row4 = mysqli_fetch_assoc($result4)){
// display etc
}
}
You may want to consider some joins in MySQL to avoid so many queries http://dev.mysql.com/doc/refman/5.7/en/join.html