Marek,
Your pattern should look like:
$pattern = ([[:digit:]]{6}0425\.jpg);
BINGO!
This will give you the image name, but remember that ereg works on
single lines and also the image might be taken at some time around
4:25. So you need a while loop to read the html line by line, in the
loop try to match the pattern, and if the pattern succeeds (first few
lines and last 2 lines are just html junk), check if it is close
enough to 4:25. Then break the while loop and display the image.
I'll look into this - 04:25 has been a constant for the months I've
been watching this, but I'll work out a routine to check if this
changes as you suggest. And thanks for the explanation of ereg() - that
will help.
And Jay,
Was that really a line break after $URLbase = ? (Probably not, but just
checking) ...
nah, just line wrapping in the email
Try adding a 'b' to your fopen ...
fopen($URLbase, rb)
... in the event that you're dealing with a Windows platform.
I presume from the forward slashes in $URLbase that I'm dealing with
just such a platform, so I've added the b (and looked up what it
means). Good tip.
Thanks for such quick and effective help, guys! What a great resource.
Mike
Michael Allan wrote:
New to the list, so I hope I'm in the right place.
I'm trying to write a small php function which checks a page filled
with a list of satellite images of earth, and loads the latest one to
have been taken at 4:25 in the morning, when the view is most
complete (full credit to be given to the original source, of course
... I'm not pretending to be running a satellite here).
Here's what I've got so far:
?php
$URLbase =
http://rsd.gsfc.nasa.gov/goesg/earth/Weather/GMS-5/jpg/vis/4km/;;
if (!($fp = fopen($URLbase, r)))
{
echo p style=color:whiteCould not open the url/p;
exit;
}
$contents = fread($fp, 100);
fclose($fp);
$pattern = (^[[:digit:]]{6}0425\.jpg$);
if (eregi($pattern, $contents, $fullviews))
{
$latestfullview = end($fullviews);
echo img src=\.$URLbase.$latestfullview.\
width=\470\
. alt=\Earth from the GMS-5 satellite above the
Timor strait\ \\;
}
else
{
echo p style=color:whiteNo image available/p;
}
?
The error I'm getting points to the fclose($fp) line, but whether or
not that's the culprit I don't know. (What little java I've written
has taught me that the effects of an error can be registered far from
it's source - perhaps the url isn't properly formed for the fopen()
function?)
I've tested the regex, and it returns true for a jpg file named with
a 10 digit number ending in 0425 (eg. 0305110425.jpg) as it should,
but not for eg. a href=0305110425.jpg0305110425.jpg/a, which is
the sort of code in which the file name is embedded in the page I'm
asking it to search, so I guess there's a problem here. Am I
understanding the caret and dollar signs correctly, as respectively
indicating the start and end of the search string? Or do they refer
to the token being searched?
I want to add more functionality to the script yet (load a default
image and email the webmaster when no image is found, date and time
of the image capture, etc.) but I need to get at least this much
working to start off with.
Any suggestions? I'm still new to this, so feel free to mention the
most obvious mistakes as well as any more subtle ones.
I'm working locally on Mac OS X if that makes any difference.
Many thanks,
Mike
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