I am a PHP beginner and I am stuck on an assignment for school. I have to create 6 different drop down menus (num1 , num2 , num3 , num4 , rows , columns) each with the numbers 1 through 10 in it. I then have make sure the form is submitted, and only when it is submitted all perfectly, then I have to use the variables to create a table based on even and odd numbers.
<form method="post" action="prelab2.php">
<select name="num1">
<option>Pick one</option>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
<option>6</option>
<option>7</option>
<option>8</option>
<option>9</option>
<option>10</option>
</select>
Above is the drop-down menu, now this is where I am really stuck.
<?php
$_POST['submit'];
$num_1=$_POST['num1'];
$num_2=$_POST['num2'];
$num_3=$_POST['num3'];
$num_4=$_POST['num4'];
$rows=$_POST['rows'];
$cols=$_POST['cols'];
?>
I figured out how to $_POST the variables, but how can I take these variables (only on submit) and turn it into a table?
Welcome to SO. $_POST['submit'] is not neccesary. In your PHP script, create the HTML for the table, and then <?php echo $num_1; ?> (or the others) where needed. The HTML must be outside the PHP code.
A line like $_POST['submit']; has no side effect... That is, it does nothing. You're just reading the variable value and not storing it anywhere.
What you're searching for seems to be echo. It writes content to the output, in your case the HTML page.
In a template-style, you can use it this way:
<?php
// initial PHP code (reading form value, etc.)
$title = 'Foo';
// after the closing tag, starts the output
?>
<html>
<title><?php echo $title; ?></title>
<!-- remaining of your HTML -->
</html>
Notice the PHP echo statement embeded into the HTML markup.
So now, you just have to compose your HTML page as intended, using your own variables...
Start here: http://www.w3schools.com/tags/tag_option.asp
<select>
<option value="n1">Volvo</option>
<option value="n2">Saab</option>
<option value="n3">Opel</option>
<option value="n...">Audi</option>
</select>
<?php $n1 = $_POST['n1']; ?>
if(isset($_POST['submit']))
{
//check if form is submitted
echo '<table style="border:colapse">'; //css trick to make nicer borders
//get post vars
$num_1=$_POST['num1'];
$num_2=$_POST['num2'];
$num_3=$_POST['num3'];
$num_4=$_POST['num4'];
//put number values in array
$nums=array($num_1,$num_2,$num_3,$num_4);
//sort array -> we will need it for outpu
sort($nums);
$rows=$_POST['rows'];
$cols=$_POST['cols'];
for($i=0;$i<$rows;$i++)
{
//print rows in loop
echo '<tr>';
for($j=1;$j<=$cols;$j++)
//now print colums -> starting from one!
{
echo '<td style="border:1px solid black;width:100px;height:20px">';
//modulo operator, to check if we are inside even or odd column
if($j % 2 == 0) {
foreach($nums as $num)
// loop thorough array of numbers
{
//if number is even -> print it
if($num % 2==0) {
echo $num;
}
}
}
else {
//if we are in odd row
foreach($nums as $num)
{
//print odd numbers
if($num % 2 !=0) {
echo $num;
}
}
}
echo '</td>';
}
echo '</tr>';
}
echo '</table>';
}
P.S. I know that this could get many down votes, but... :)