look ahead in foreach / use next() in foreach

[scrupul0us]

so im looping through a ton of IP's and Im trying to separate blocks as far as it's c class

so I'm looping through my array:

	echo '<table border="1">';
	foreach($ranges as $range)
	{
		echo '<tr>';
		foreach($range as $ip)
		{
			echo "<td>$ip</td>";
		}
		echo '</tr>';

	list($a,$b,$c,$d) = explode('.', $range[0]);
	list($w,$x,$y,$z) = explode('.', next($range[0]));
	if($a != $w OR $b != $x OR $c != $y)
	{
		echo '</table><br/><table>';
	}
}
echo '</table>';

i'm getting this error:

Warning: next() [function.next]: Passed variable is not an array or object

Can this be done?

[scrupul0us]

I did try:

		list($a,$b,$c,$d) = explode('.', $range[0]);
			next($range);		
		list($w,$x,$y,$z) = explode('.', $range[0]);
			prev($range);

but both lists contain the EXACT values on each iteration

[Weedpacket]

next($range[0])? $range[0] is a string, not an array.

Don't you mean $range[1]? I.e., the element after $range[0]?

[scrupul0us]

$ranges is a 2d array

$range would be one container within

$range[0] would be the IP address for that container (there are other elements that contain other data... [1],[2],etc...)

i need to look forward to the next container and grab it's element[0]...

I thought perhaps next($ranges) instead of next($range) but that doesnt do it either

[scrupul0us]

Array ($ranges)
(
    [0] => Array ($range)
        (
            [0] => 192.168.1.1
            [1] => misc
        )

[1] => Array ($range)
    (
        [0] => 10.1.1.2
        [1] => misc
    )
)

so if the array pointer is currently at [0][0] (192.168.1.1) i need to next() to grab [1][0] (10.1.1.2) so i can compare

[bradgrafelman]

Did you read the manual page for [man]next/man It advances the internal point of the array you pass it. In other words, you pass it the array that the [man]foreach/man loop is currently iterating through if you want to view the next entry before the loop's next iteration.

Since this array is numerically indexed, and assuming there are no gaps in the array indexes, you could just switch to a [man]for/man loop and check index $i+1.

[bradgrafelman]

Test

[niroshan]

hi scrupul0us,

Try this,

echo '<table border="1">';
while ($range = current($ranges)) 
{
	echo '<tr>';
	foreach($range as $ip)
	{
		echo "<td>$ip</td>";
	}
	echo '</tr>';

list($a,$b,$c,$d) = explode('.', $range[0]);   
next($ranges);

$nextArr = current($ranges);

list($w,$x,$y,$z) = explode('.', $nextArr[0]);

if($a != $w OR $b != $x OR $c != $y)
{
	echo '</table><br/><table>';
}
}
echo '</table>';

[Weedpacket]

foreach($ranges as $range)
{
	$ips[ip2long($range[0]) >> 8][] = $range;
}

foreach($ips as $block)
{
    // start table
    foreach($block as $range)
    {
       // echo $range[0]; i.e., the IP
    }
    // end table
}

The >> 8 is to ignore the last 8 bits.

[scrupul0us]

niroshan;10945477 wrote:

Try this...

That works 99%

When I run through now I get one straggler in its own table

192.168.1.52
192.168.1.56
192.168.1.60
192.168.1.64
192.168.1.72
192.168.1.80

192.168.1.96 <--- straggler

192.168.2.45
192.168.2.46
192.168.2.47
192.168.2.48
192.168.2.49

[scrupul0us]

and if i seed the values:

$a = $b = $c = $d = $w = $x = $y = $z = '';

and move the table output before the list()'s then I get

192.168.1.52
192.168.1.56
192.168.1.60
192.168.1.64
192.168.1.72
192.168.1.80
192.168.1.96

192.168.2.45 <--- straggler

192.168.2.46
192.168.2.47
192.168.2.48
192.168.2.49

I'm at a loss

[scrupul0us]

else
{
	natsort2d($ranges);
	for($i=0;$i<count($ranges);$i++)
	{
		array_shift($ranges[$i]); //GET RID OF THE PREG_MATCH_ALL 'MATCH'
	}
	echo '<table border="1">';
	echo   '<tr>
			<td>NETWORK</td>
			<td>MASK</td>
			<td>IPs</td>
			<td>ID</td>
			<td>HOSTNAME</td>
			<td>NOTES</td>
			<td>C</td>
			<td>P</td>
			</tr>'."\n";

//$a = $b = $c = $d = $w = $x = $y = $z = '';
    //ONLY NEEDED IF PLACING IP CHECK ABOUT LIST DECLARES
foreach($ranges as $range)
{
	echo "<tr>\n";
	foreach($range as $var)
	{
		echo "<td>$var</td>\n";
	}
	echo "</tr>\n";

	list($a,$b,$c,$d) = explode('.', $range[0]);
	next($ranges);
	$nextArr = current($ranges);
	list($w,$x,$y,$z) = explode('.', $nextArr[0]);

	if($a != $w OR $b != $x OR $c != $y)
	{
		echo '</table><br/><table border="1">'."\n";
	}
}
echo '</table>';
}