Retrieve Loop textbox - php

Question

page_form.php
echo '<div style="text-align:center;margin-left:25px;">
<form action="grad.php" method="post">
<table width-"100%">
<tr><th style="padding:12px;">LETTER </th>
<th style="padding:12px;">INTERVAL</th>
<th style="padding:12px;">GT</th>
</tr>';
for($i=0;$i<=5;$i++)
{
echo '<tr><td style="padding:12px;"><input type="text" name="letter_'.$i.'"></td>
<td style="padding:12px;"><input type="text" name="interval'.$i.'"></td>
<td style="padding:12px;"><input type="text" name="gt'.$i.'"></td>
</tr>';
}
echo '<tr><td><input type="submit" name="submit" value="submit"></td></tr>';
echo '</table>
</form>
</div>';
grad.php
$letter = $_POST['letter'];
$interval = $_POST['interval'];
$gt = $_POST['gt'];
$s = mysql_query("INSERT INTO grad_table(letter,markint,gradepoint) VALUES('$letter',$interval,$gt) ");
I have given all the textboxes in a forloop. when I click on submit I need to get all the 5 textbox values, but right now iam getting only the 1st row.
Database Structure
Field Type Collation Attributes Extra
id bigint(10) UNSIGNED AUTO_INCREMENT
letter varchar(255) utf+general_ci
markint bigint(10)
gt bigint(10)

Answer 1

Your textbox names are not letter, as you're using them - they are letter_0, letter_1, etc.
Also, interval is a MySQL reserved-word and you'll need to escape it using backticks: `interval`.
To retrieve all of them, you can hardcode all of their names such as $letter1 = $_POST['letter_1'];, or you can do it in another loop:
for ($i=0; $i<5; $i++) {
$letter = $_POST['letter_' . $i];
$interval = $_POST['interval' . $i];
$gt = $_POST['gt' . $i];
$s = mysql_query("INSERT INTO `grad_table` (`letter`, `interval`, `gt`) VALUES ('$letter',$interval,$gt)");
}
One big thing to note here is that you should really validate your user-input before inserting it into the database. First, you can use isset() before accessing the variables to make sure the user submitted the data. Second, you can use mysql_real_escape_string() to sanitize the string input and intval() for the integers:
for ($i=0; $i<5; $i++) {
// check that each field is posted
if (!isset($_POST['letter_' . $i]) || !isset($_POST['interval' . $i]) || !isset($_POST['gt' . $i])) continue;
// assign & sanitize
$letter = mysql_real_escape_string($_POST['letter_' . $i]);
$interval = intval($_POST['interval' . $i]);
$gt = intval($_POST['gt' . $i]);
$s = mysql_query("INSERT INTO `grad_table` (`letter`, `interval`, `gt`) VALUES ('$letter',$interval,$gt) ");
}
Now, this doesn't "validate" your data, but at least it will help prevent SQL injection and simply PHP errors.

Answer 2

Your post data should containt $_POST['interval0'], $_POST['interval1'], $_POST['interval2']...
You will have to trawl through each $_POST to get all the answers. I an frankly surprised you are getting any post data with your code as it is.

Answer 3

you should modify following
for($i=0;$i<=5;$i++)
{
echo '<tr><td style="padding:12px;"><input type="text" name="letter['.$i.']"></td>
<td style="padding:12px;"><input type="text" name="interval['.$i.']"></td>
<td style="padding:12px;"><input type="text" name="gt['.$i.']"></td>
</tr>';
}
then you can do following
foreach($_POST['letter'] as $i=>$v) {
mysql_query("INSERT INTO grad_table(letter,interval,gt) VALUES('{$_POST['letter'][$i]}',{$_POST['interval'][$i]},{$_POST['gt'][$i]}) ");
}