Sorting multiple XML data by date

[junkmate]

I am making an RSS parser that takes multiple XML inputs in to an
array and then sorts them by their date value... and it 'almost'
works... I always lose the top value of the second rss feed to be
parsed... its pretty annoying as this is often the most recently
updated RSS item that is missing from my multi-feed...

Help me please:
Currently, I am doing this:

usort($xmlreader_parsed_data, "rss_cmp");

which calls this function:

function rss_cmp($a, $b)
{
$a = strtotime($a->date);
$b = strtotime($b->date);

if ($a == $b) {
return 0;
}
return ($a $b) ? -1 : 1;
}

[junkmate]

UPDATE: I just added the following to the rss_cmp function, and it
seems to have worked... is it ok? Or will I regret this somewhere?

if (!$a) { return -1; }
if (!$b) { return 1; }

[petersprc]

Seems to be a typo, comparison should be $a < $b.

I would make sure error_reporting(E_ALL) is on to see if that gives
any hints.

On Aug 15, 12:08 am, junkmate <[e-mail]:

I am making an RSS parser that takes multiple XML inputs in to an
array and then sorts them by their date value... and it 'almost'
works... I always lose the top value of the second rss feed to be
parsed... its pretty annoying as this is often the most recently
updated RSS item that is missing from my multi-feed...

Help me please:

Currently, I am doing this:

usort($xmlreader_parsed_data, "rss_cmp");

which calls this function:

function rss_cmp($a, $b)
{
$a = strtotime($a->date);
$b = strtotime($b->date);

if ($a == $b) {
return 0;
}
return ($a $b) ? -1 : 1;
}

[junkmate]

putting the coparison that way gives me results the wrong way around.
I want the latest date at the top (ie. the smallest) and to do that I
have to use - shouldnt cause a problem though right?


On Aug 17, 2:10 am, petersprc <[e-mail]:

Seems to be a typo, comparison should be $a < $b.

I would make sure error_reporting(E_ALL) is on to see if that gives
any hints.

On Aug 15, 12:08 am, junkmate <[e-mail]:

I am making an RSS parser that takes multiple XML inputs in to an
array and then sorts them by their date value... and it 'almost'
works... I always lose the top value of the second rss feed to be
parsed... its pretty annoying as this is often the most recently
updated RSS item that is missing from my multi-feed...

Help me please:

Currently, I am doing this:

usort($xmlreader_parsed_data, "rss_cmp");

which calls this function:

function rss_cmp($a, $b)
{
$a = strtotime($a->date);
$b = strtotime($b->date);

if ($a == $b) {
return 0;
}
return ($a $b) ? -1 : 1;
}

[petersprc]

Yes you're definitely right. I thought that might the cause of the
unexpected results. Not sure why data would go missing. I would see if
any warnings are triggered or I guess strtotime could also fail.

On Aug 16, 10:22 pm, junkmate <[e-mail]:

putting the coparison that way gives me results the wrong way around.
I want the latest date at the top (ie. the smallest) and to do that I
have to use - shouldnt cause a problem though right?

On Aug 17, 2:10 am, petersprc <[e-mail]:

Seems to be a typo, comparison should be $a < $b.

I would make sure error_reporting(E_ALL) is on to see if that gives
any hints.

On Aug 15, 12:08 am, junkmate <[e-mail]:

I am making an RSS parser that takes multiple XML inputs in to an
array and then sorts them by their date value... and it 'almost'
works... I always lose the top value of the second rss feed to be
parsed... its pretty annoying as this is often the most recently
updated RSS item that is missing from my multi-feed...

Help me please:

Currently, I am doing this:

usort($xmlreader_parsed_data, "rss_cmp");

which calls this function:

function rss_cmp($a, $b)
{
$a = strtotime($a->date);
$b = strtotime($b->date);

if ($a == $b) {
return 0;
}
return ($a $b) ? -1 : 1;
}