Grids? 2d array?

dougal85

Ok, I want to try and do this:

I want a grid, the size of a chess board (8x8). and i want a boolean value for each of the cells.

Also want to be able to display it out easily aswell.

what is the best was to approach this? would it be with a 2d array? (something ive not actually used yet)

pointers would be great

stewartship

definitely use a multiple array:

$multiple = array(array1, array2);

where array 1 and array 2 are loaded with the booleans, or inputs that can be used as booleans upon checking.

then calls to the cells can be made:

$multiple[0][0];
$multiple[0][1];
$multiple[1][0];

etc. best way is to use for loops with counters to get the outputs

if you have never used multiple arrays before check out the manuals online, most have some good examples to get you used to it! Multiple arrays are really useful tools.

Hope this helps

dougal85

excillent!

been searching google for a while couldnt find a simple example - thanks 🙂

dougal85

<?php

require_once("./inc/functions.php");

$arrayStart = array(
1 => 0,
2 => 0,
3 => 0,
4 => 0,
5 => 0,
6 => 0,
7 => 0
);

$gridArray = array($arrayStart, $arrayStart);

startUp();




?>

<html>

<head>

	<title>
		Puzzel With Pawns
	</title>

</head>

<body>

<?php

	$returnTest = 0;

	for ($i=0;$i<=7;$i++){

		for ($j=0;$j<=7;$j++){

			echo $gridArray[$i][$j];

			if (($i = $returnTest) && ($j = 7)){
				echo "<BR>";
				$returnTest .= 1;
			}

		}

	}

?>

</body>
</html>

Thats my code so far.

<?php

function startUp(){


for ($i=0;$i<=7;$i++){

	for ($j=0;$j<=7;$j++){

		$gridArray[$i][$j] = 0;

	}

}

$gridArray[3][4] = 1;
$gridArray[3][4] = 1;

}

?>

and my include not much in it yet.

Anyway... I'm getting these errors ..

Notice: Undefined offset: 3 in E:\www\pawns\index.php on line 38

Notice: Undefined offset: 0 in E:\www\pawns\index.php on line 46
0000000
Notice: Undefined offset: 0 in E:\www\pawns\index.php on line 46
0000000
Notice: Undefined offset: 2 in E:\www\pawns\index.php on line 46

repeated over n over.

Any suggestions or further pointers?

dougal85

Ok, I want to try and do this:

I want a grid, the size of a chess board (8x8). and i want a boolean value for each of the cells.

Also want to be able to display it out easily aswell.

<?php

require_once("./inc/functions.php");

$arrayStart = array(
1 => 0,
2 => 0,
3 => 0,
4 => 0,
5 => 0,
6 => 0,
7 => 0
);

$gridArray = array($arrayStart, $arrayStart);

startUp();




?>

<html>

<head>

	<title>
		Puzzel With Pawns
	</title>

</head>

<body>

<?php

	$returnTest = 0;

	for ($i=0;$i<=7;$i++){

		for ($j=0;$j<=7;$j++){

			echo $gridArray[$i][$j];

			if (($i = $returnTest) && ($j = 7)){
				echo "<BR>";
				$returnTest .= 1;
			}

		}

	}

?>

</body>
</html>

Thats my code so far.

<?php

function startUp(){


for ($i=0;$i<=7;$i++){

	for ($j=0;$j<=7;$j++){

		$gridArray[$i][$j] = 0;

	}

}

$gridArray[3][4] = 1;
$gridArray[3][4] = 1;

}

?>

and my include not much in it yet.

Anyway... I'm getting these errors ..

Notice: Undefined offset: 3 in E:\www\pawns\index.php on line 38

Notice: Undefined offset: 0 in E:\www\pawns\index.php on line 46
0000000
Notice: Undefined offset: 0 in E:\www\pawns\index.php on line 46
0000000
Notice: Undefined offset: 2 in E:\www\pawns\index.php on line 46

repeated over n over.

Any suggestions or further pointers?

i realise this is a repeated thread from : http://phpbuilder.com/board/showthread.php?t=10322024

but its marked as resolved - and i dont know how to change that 🙂

dougal85

moved -> http://phpbuilder.com/board/showthread.php?p=10719339#post10719339

didnt know how to re-open this thread so it didnt appear resolved.

Weedpacket

You only have a 2x8 array. One of them (Which you're iterating over with $i) has array indices 0, 1, and so $gridArray[2] is undefined; while the other one has indices 1, 2, 3, 4, 5, 6, 7 (because you said so), and so $gridArray[1][0] is undefined. Hence all the error messages.
$gridArray = array();
Since you want an 8x8 chessboard, you want an array with 8 elements, each of which is an array of 8 elements.
While there are many ways of doing it (something along the lines of that suggested: make an array to represent one row, then make an array of copies of that array), the most self-explanatory code would be

$gridArray = array();
for($i=0; $i<8; $i++)
for($j=0; $j<8; $j++)
$gridArray[$i][$j] = 0;

Use [man]var_export[/man] if you want to see what that would look like without the loops.

dougal85

ah so it is...
cant believe i forgot the 0 🙁

thanks