file is missing what browser outputs

[scrupul0us]

im taking an array of ip ranges:

rangeStart|rangeStop

exploding it into individual /24's

<?php
        foreach($rangesLong as $range)
        {
                if(stripos($range,':') === false) //IPV4
                {
                        $tmp = explode('|',$range);
                        list($a,$b,$c,$d) = explode('.',$tmp[0]); //RANGE START
                        list($w,$x,$y,$z) = explode('.',$tmp[1]); //RANGE STOP

                    //CALC DIFFERENCES FOR EACH 8-BIT
                    $dA = $w - $a;
                    $dB = $x - $b;
                    $dC = $y - $c;
                    $dD = $z - $d;

                    $xml = '<?xml version="1.0" encoding="UTF-8" ?>'."\r\n";
                    $xml .= "<nets>\r\n";
                    for($i=$a;$i<=$a + $dA;$i++)
                    {
                            for($j=$b;$j<=$b + $dB;$j++)
                            {
                                    for($k=$c;$k<=$c + $dC;$k++)
                                    {

                                            $xml .= "<net>$i.$j.$k.0</net>";
                                    }
                            }
                    }
                    $xml .= '</nets>';
                    file_put_contents('nets.xml',$xml);
}}
?>

my issue is this line on the inner-most for loop (or so I think):

$xml .= "<net>$i.$j.$k.0</net>";

when i run this, its only displaying the /24's for the last /21 in my original array:

[0] => 0.0.0.0/23
[1] => 0.0.0.0/24
[2] => 0.0.0.0/24
[3] => 0.0.0.0/20
[4] => 0.0.0.0/18
[5] => 0.0.0.0/19
[6] => 0.0.0.0/21

(i do realize this is not the rangeStart|rangeStop array but its just to show the qty im working with)

now, if I change my code to:

echo $xml .= "<net>$i.$j.$k.0</net>";

the browser shows ALL the /24's AND so does the file I'm writing to

how the HECK does echoing the line make it work?

This is going to end up as a cron script the cache results so I could just pipe it to >/dev/null 2>&1

But I'd really like to know why it's behaving so odd

[Undrium]

I know there is no difference, but what happens when you turn this:

$xml .= "<net>$i.$j.$k.0</net>";

into this:

$xml .= "<net>".$i.".".$j.".".$k.".0</net>";

[scrupul0us]

same result :/

[scrupul0us]

so i figured a more elegant way to do my looping today but the issue still persists:

<?php
	foreach($rangesLong as $range)
	{
		if(stripos($range,':') === false) //IPV4
		{
			$tmp = explode('|',$range);

		//WE USE SPRINTF HERE TO GET THE UNSIGNED VALUE
		//TO PATCH 32 ARCH ISSUE WITH RETURNING NEG NUMBERS
		$start = sprintf("%u", ip2long($tmp[0]));
		$stop  = sprintf("%u", ip2long($tmp[1]));


		$xml = '<?xml version="1.0" encoding="UTF-8" ?>';
		$xml .= "\r\n";
		$xml .= "<nets>\r\n";

		foreach( range($start,$stop ) as $ip)
		{
			$xml .= '<net type="ipv4">'.long2ip($ip).'</net>';
			$xml .= "\r\n";
		}

		$xml .= '</nets>';
		file_put_contents('nets.xml',$xml);	
	}
	else
	{
		//ipv6
	}
}
?>

[scrupul0us]

woooooow do i feel stupid

resetting the entire xml document inside the top-level foreach

/faceplam

...fixed...

<?php
    $xml = '<?xml version="1.0" encoding="UTF-8" ?>';
    $xml .= "\r\n";
    $xml .= "<nets>\r\n";
    foreach($rangesLong as $range)
    {
        if(stripos($range,':') === false) //IPV4
        {
            $tmp = explode('|',$range);

        //WE USE SPRINTF HERE TO GET THE UNSIGNED VALUE
        //TO PATCH 32 ARCH ISSUE WITH RETURNING NEG NUMBERS
        $start = sprintf("%u", ip2long($tmp[0]));
        $stop  = sprintf("%u", ip2long($tmp[1]));

        foreach(range($start,$stop) as $ip)
        {
            $xml .= '<net type="ipv4">'.long2ip($ip).'</net>';
            $xml .= "\r\n";
        }
    }
    else
    {
        //ipv6
    }
}
$xml .= '</nets>';
file_put_contents('nets.xml',$xml);
?>