PHP array of numbers with range() and foreach loop - php

Question

I have a really strange problem with range();
According to docs :
Create an array containing a range of elements
But when I do :
foreach (range(900,950,1) as $art_id){
//ob_start();
//do stuff
//do a lot more stuff
echo $art_id;
//ob_get_clean(); }
or even
$arts_id = range (900, 920);
foreach ($arts_id as $art_id){
//ob_start();
//do stuff
//do a lot more stuff
echo $art_id;
//ob_get_clean(); }
The output is strangly repeating itself in a series like
"900,900,901,900,901,902,900,901,9002,903,900..."
meaning it is comming back to the first ID after each loop.
(1st iteration -> 900
2nd iteration -> 900,901
3rd iteration -> 900,901,902
...)
When I just put a manual array it works perfectly in order and no duplicates :
$arts_id = array(900,901,902,903,904,905,906,907,908,909,910...);
What Am I doing wrong (again ?? )
EDIT I
here is the whole script :
http://pastebin.com/ZHm3ub6n
It is actually a slightly modified version of the slashdot scraping example included in the simplehtmldom script . Nothing special.
It is executed inside WP but OUTSIDE the loop ..

Answer 1

It must be in the rest of your code, because this works fine.
please share more of the script.
It looks like the foreach is nested within a similair foreach,
$arts_id = range (900, 920);
foreach ($arts_id as $art_id){
foreach (range (900,$art_id) as $art_id2){
echo $art_id2."<br/>";
}
}
This produces an output you've described
EDIT
Personally i'd add the the function scraping_slashdot a reset of the variable $ret just in case.
for example:
$ret = array();
Currently the echo of $output is within the loop, which creates an output like the following:
Article 1
Article 1, Article 2
Article 1, Article 2, Article 3
etc.
place echo $output outside the loop, or $ouptut = ''; inside the loop.