Need Help With PHP Code

MjM8082 · July 25, 2011

I need help writing a code that will calculate AND display the average of my table. I've been looking through books and online forums but can't seem to find out how to do this. I'm new to PHP also. Figured this would be the best site to come to.

This is the code I have so far...

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Week 1 Lab</title>
</head>

<body>

<?php
if (isset($_POST['btn_submit']))
{
	$number_of_rows = $_POST['number_of_rows'];

	echo "<table cellpadding='10' cellspacing='10' border='1'";
	echo "<tr>";
	for($ii = 0; $ii < $number_of_rows; $ii++)
	{
        echo "<tr>";
	for ($i=0; $i<$number_of_rows; $i++)
	{
		$my_no = mt_rand(1, 100);



			if (($my_no%2==0)&&($my_no%3==0)) {
				$color="#FF00FF";
			}
			else if ($my_no%2==0) {
				$color="#0000FF"; 
			}
			else if ($my_no%3==0) {
				$color="#FF0000";
			}
			else {
				$color ="#FFFFFF";
			}
			echo "<td style=\"background: {$color};\">$my_no</td>";
		}


		echo "</tr>";
	}


	echo "</table>";
}


?>



<form name="lab1" method="post" action="lab1.php">
<input type="textbox" name="number_of_rows" value="5" />
<input type="submit" name="btn_submit" value="Generate Grid" />
</form>

</body>
</html>

Nodral · July 25, 2011

Hi

Every time your script generates a number, get it to allocate into an array (eg $average_calc), then use the following.

$total=array_sum($average_calc);

$count=array_count($average_calc);

$average=$total/$count;

MjM8082 · July 25, 2011

How would I put that into my code? Where exactly? Bare with me, still learning how to code.

AyKay47 · July 25, 2011

does your table display the layout that you expect it to? I have doubts about the structure, however to find the average this should work for you..

if (isset($_POST['btn_submit']))
{
	$number_of_rows = $_POST['number_of_rows'];

	echo "<table cellpadding='10' cellspacing='10' border='1'";
	echo "<tr>";
	for($ii = 0; $ii < $number_of_rows; $ii++)
	{
        echo "<tr>";
	for ($i=0; $i<$number_of_rows; $i++)
	{
		$my_no = mt_rand(1, 100);



			if (($my_no%2==0)&&($my_no%3==0)) {
				$color="#FF00FF";
			}
			else if ($my_no%2==0) {
				$color="#0000FF"; 
			}
			else if ($my_no%3==0) {
				$color="#FF0000";
			}
			else {
				$color ="#FFFFFF";
			}
			echo "<td style=\"background: {$color};\">$my_no</td>";
		}

	$total += $my_no;
		echo "</tr>";
	}


	echo "</table>";
$average = ($total/$number_of_rows);
print $average;
}

Nodral · July 25, 2011

Try this

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Week 1 Lab</title>
</head>
<body>
<?php
if (isset($_POST['btn_submit']))	{
$number_of_rows = $_POST['number_of_rows'];
echo "<table cellpadding='10' cellspacing='10' border='1'";
echo "<tr>";
for($ii = 0; $ii < $number_of_rows; $ii++)		{
	echo "<tr>";
	for ($i=0; $i<$number_of_rows; $i++)		{
		$my_no = mt_rand(1, 100);
		$average_calc[]=$my_no;
		if (($my_no%2==0)&&($my_no%3==0)) {
			$color="#FF00FF";
		}
		else if ($my_no%2==0) {
			$color="#0000FF";
		}
		else if ($my_no%3==0) {
			$color="#FF0000";
		}
		else 
		{	
			$color ="#FFFFFF";	
		}				
		echo "<td style=\"background: {$color};\">$my_no</td>";
	}
	echo "</tr>";
}
echo "</table>";
}

$total=array_sum($average_calc);
$count=count($average_calc);
$average=$total/$count;

?>	
<form name="lab1" method="post" action="">
<input type="textbox" name="number_of_rows" value="5" />
<input type="submit" name="btn_submit" value="Generate Grid" />
<?php
echo $average;
?>
</form>
</body>
</html>

I've added in

line 16 to create an array

Lines 37 - 39 to calculate the average

Lines 45 - 47 to print on screen

AyKay47 · July 25, 2011

Try this

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Week 1 Lab</title>
</head>
<body>
<?php
if (isset($_POST['btn_submit']))	{
$number_of_rows = $_POST['number_of_rows'];
echo "<table cellpadding='10' cellspacing='10' border='1'";
echo "<tr>";
for($ii = 0; $ii < $number_of_rows; $ii++)		{
	echo "<tr>";
	for ($i=0; $i<$number_of_rows; $i++)		{
		$my_no = mt_rand(1, 100);
		$average_calc[]=$my_no;
		if (($my_no%2==0)&&($my_no%3==0)) {
			$color="#FF00FF";
		}
		else if ($my_no%2==0) {
			$color="#0000FF";
		}
		else if ($my_no%3==0) {
			$color="#FF0000";
		}
		else 
		{	
			$color ="#FFFFFF";	
		}				
		echo "<td style=\"background: {$color};\">$my_no</td>";
	}
	echo "</tr>";
}
echo "</table>";
}

$total=array_sum($average_calc);
$count=count($average_calc);
$average=$total/$count;

?>	
<form name="lab1" method="post" action="">
<input type="textbox" name="number_of_rows" value="5" />
<input type="submit" name="btn_submit" value="Generate Grid" />
<?php
echo $average;
?>
</form>
</body>
</html>

I've added in

line 16 to create an array

Lines 37 - 39 to calculate the average

Lines 45 - 47 to print on screen

should work but is more work than needs to be done here

marcus · July 25, 2011

No need to put it in an array.

$sum = 0;

for($i = 0; $i < $countRows; $i++){
     $sum += mt_rand(1,100);
     // other code...
}

$avg = $sum/$countRows;

AyKay47 · July 25, 2011

No need to put it in an array.

$sum = 0;

for($i = 0; $i < $countRows; $i++){
     $sum += mt_rand(1,100);
     // other code...
}

$avg = $sum/$countRows;

same code I posted

marcus · July 25, 2011

No need to put it in an array.

$sum = 0;

for($i = 0; $i < $countRows; $i++){
     $sum += mt_rand(1,100);
     // other code...
}

$avg = $sum/$countRows;

same code I posted

Your code would throw an undefined variable.

Nodral · July 25, 2011

should work but is more work than needs to be done here

There's no "should" should about it.

It does work lol

AyKay47 · July 25, 2011

No need to put it in an array.
$sum = 0;

for($i = 0; $i < $countRows; $i++){
     $sum += mt_rand(1,100);
     // other code...
}

$avg = $sum/$countRows;
same code I posted
Your code would throw an undefined variable.

and where would the undefined variable be?

marcus · July 25, 2011

$total is never defined before you try incrementing it.

AyKay47 · July 25, 2011

should work but is more work than needs to be done here

There's no "should" should about it.

It does work lol

right but for someone that is new to PHP, dealing with arrays and array functions might not be the best approach here...it's important that he understands what he is doing instead of simply copy pasting code...but yes your code w :-*ill work too...

MjM8082 · July 25, 2011

Thanks for the replies everyone, the codes worked great. One more quick question... How would I make it say "Your average is..." in text and then the number next to it?

Nodral · July 25, 2011

echo"</br>Your Average is $average";

Don't worry AkKay47, I won't get him to put that in an array!!! lol

AyKay47 · July 25, 2011

$total is never defined before you try incrementing it.

sure it is

$total += $my_no;

right there..

OP

print "The average is: $average";

AyKay47 · July 25, 2011

echo"</br>Your Average is $average"
Don't worry AkKay47, I won't get him to put that in an array!!! lol

lol...your're too quick with the replies..keep beating me... :'(

marcus · July 25, 2011

$total is never defined before you try incrementing it.

sure it is
$total += $my_no;
right there..

OP
print "The average is: $average";

I think you should go back to the basics. You're trying to update a variable that has never been defined before. $total needs to be instantiated before you can start throwing things at it.

$total = 0; // this would be instantiating it

MjM8082 · July 25, 2011

Thanks AyKay and Nodral, appreciate it a lot.

AyKay47 · July 25, 2011

$total is never defined before you try incrementing it.

sure it is
$total += $my_no;
right there..

OP
print "The average is: $average";
I think you should go back to the basics. You're trying to update a variable that has never been defined before. $total needs to be instantiated before you can start throwing things at it.
$total = 0; // this would be instantiating it

right you are, I don't need to go back to basics..human error

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