Another one of my "What does this do?" questions

Easter_Bunny

A piece of code looks like this:

		$f = file($afile);

	foreach ($f as $key=>$val)
	{
		$entry = explode(",",$val);
		foreach ($entry as $key2=>$val2)
		{
			$tmp=explode("-",$val2);
			$item = $tmp[0];
			$price = $tmp[1];
			if ($item)
			{
			  print("<input type=checkbox name=$item> $item R".number_format($price,2)."<br>");	
			}
		}
	}

Can someone take this appart and tell me what each step does in words that I'd understand?

Thanks!😃

ahundiak

Assume you have a file called data.txt with
car-20,boat-30,
bill-2,john-3,george-4,

$f = file('data.txt') reads the file and creates an array with each element being one line in the file

foreach($f as $key=>$var) cycles through the array setting $var equal to each line in the file. $key in this case will just be the line number starting at zero.

$entry = explode(',',$val) breaks a single line up by commas. So, for the first line, you get two entries car-20 and boat-30.

The entry array is cycled through and exploded by the '-' so you end up with $item=car and $price = 20.

These are then formatted and outputted as a checkbox element.

Easter_Bunny

Thanks!

My next question to you is:

When I've got all the checkboxes on the screen, how do I pass the checked items on to the next form where the user gets shown a list of what he bought as well as the total cost of it all?

I've got this question in another thread somewhere, but nobody has answered it yet.

Thanks for the help! Appreciate it 😉

ednark

in php...

if a form submits a checkbox....

if the user has checked it... it will exist on the next page with whatever value you assigned it...

if the user did not check it... it will not even exist at all on the next page

the way to check for this is with

isset( $_POST['checkbox_value'] );

isset( $_GET['checkbox_value'] );

Easter_Bunny

Excuse me for being dumb, but I have no idea on how to do this.

The part of my script that I use for the displying of the items looks like this:

	{
		print("<form method=post>");
		print("You have selected the following<br><br>");

	$f = file($afile);
	$a++;
	foreach ($f as $key=>$val)
	{
		$entry = explode(",",$val);
		foreach ($entry as $key2=>$val2)
		{
			$tmp=explode("-",$val2);
			$item = $tmp[0];
			$price = $tmp[1];
		  if ($item[$a])
	  	{
			  print("$item[$a] at a cost of R $price<br>");
		  	$total += $price;
		  }
		  $a++;
		}
    print("<br>Total cost : R $total<br><br>");
	  print("<a href=http://devin/custom.php?mode=shop&action=selectitems>Back</a><br>");
    print("<a href=http://devin/custom.php?mode=shop&action=checklogin>Back to start</a><br>");
	}

I know this is wrong (because it doesn't work) and should be in a PHP magazine in the funnies column, but I have no idea on how to do the last part of this. I stole the "foreach" part from the "selectitems" part of my program(got a little help there). :rolleyes:

Could you please show me what I'm doing wrong and please put in some comments to help me understand?

Thanks!

planetsim

Let me point something out..

do this for print

print"hi there";

not this

print("hi there");

the parenthesis arent needed "(" ")"

Easter_Bunny

Originally posted by ednark
in php...

if a form submits a checkbox....

if the user has checked it... it will exist on the next page with whatever value you assigned it...

if the user did not check it... it will not even exist at all on the next page

the way to check for this is with

isset( $_POST['checkbox_value'] );

or

isset( $_GET['checkbox_value'] );

😕

HELP!

ednark

ok if that didn't make sense.. i think you would do better reading the manual and trying the examples in there