How to pass options value from each table row? - php

Question

I am creating a table with rows which has options in each cells. The options are received from database table. Since each row has a options cell, I have to receive the value from each row. In select tag, the 'name' is incremented with the rows. But I am only getting the value of the last row.
Attaching the code section here.
for ($i = 1; $i <= $_GET['pno']; $i++) {
echo'<tr>';
echo "<td>$i</td>";
echo '<td><select name="prod_$i">'; echo "prod_$i";
//Query for production table gets processed.
$qry_pr="SELECT * FROM production";
$result_pr=mysql_query($qry_pr);
$rows_pr=mysql_affected_rows($con);
//Production options get filled from the table data.
for($j=0;$j<=$rows_pr;$j++)
{
$res_arr_pr=mysql_fetch_array($result_pr);
echo "<option value=$res_arr_pr[0]>$res_arr_pr[1]</option>";
//$res++;
}
//mysql_close($con);
echo '</select></td>';
echo '<td><select name="prod_mu_$i">';
//Query for measurement_unit table gets processed.
$qry_mu="SELECT * FROM measurement_unit";
$result_mu=mysql_query($qry_mu);
$rows_mu=mysql_affected_rows($con);
//Unit options get filled from the table data
for($k=0;$k<=$rows_mu;$k++)
{
$res_arr_mu=mysql_fetch_array($result_mu);
echo "<option value=$res_arr_mu[0]>$res_arr_mu[1]</option>";
}
echo '</td>';
echo '</tr>'; echo "prod_$i";
}
echo'</table><br>';
Hope I am clear with the query.
Thank you.

Answer 1

You have placed the SQL Query inside the for loop making it heavy. Because it will perform the same query over and over again. If you tweak the code a little you can use perform a single query and use that for all loop iterations.
<?php
//initialize blank
$productions = $measurements = '';
// create the production select box
$qry_pr="SELECT * FROM production";
$result_pr=mysql_query($qry_pr);
if( mysql_num_rows($result_pr) )
{
$productions .= "<select name='prod_%index%'>";
while( $rec_pr = mysql_fetch_row($result_pr) )
{
$productions .= "<option value='{$rec_pr[0]}'>{$rec_pr[1]}</option>";
}
$productions .= "</select>";
}
// create the measurement select box
$qry_mu="SELECT * FROM measurement_unit";
$result_mu=mysql_query($qry_mu);
if( mysql_num_rows($result_mu) )
{
$measurements .= "<select name='prod_mu_%index%'>";
while( $rec_mu = mysql_fetch_array($result_mu) )
{
$measurements .= "<option value='{$rec_mu[0]}'>{$rec_mu[1]}</option>";
}
$measurements .= "</select>";
}
?>
<table>
<?php for($i=1;$i<=$_GET['pno'];$i++): ?>
<tr>
<td><?php echo str_replace('%index%',$i,$productions); ?></td>
<td><?php echo str_replace('%index%',$i,$measurements); ?></td>
</tr>
<?php endfor; ?>
</table>

Answer 2

Change:
echo '<td><select name="prod_$i">'; echo "prod_$i";
to:
echo '<td><select name="prod_' . $i . '[]">'; echo "prod_$i";

Answer 3

mysql_affected_rows will only give you the number of affected rows by the last INSERT, UPDATE, REPLACE or DELETE query. Your performing a SELECT, so the $rows_mu value will be wrong.
Instead of:
$rows_mu=mysql_affected_rows($con);
//Unit options get filled from the table data
for($k=0;$k<=$rows_mu;$k++)
{
$res_arr_mu=mysql_fetch_array($result_mu);
echo "<option value=$res_arr_mu[0]>$res_arr_mu[1]</option>";
}
try this:
//Unit options get filled from the table data
while ($res_arr_mu = mysql_fetch_array($result_mu))
{
echo "<option value=$res_arr_mu[0]>$res_arr_mu[1]</option>";
}