Databases
StackOverflow2013
Postsdbo
POIgnorance OR bug on PHP's "foreach" construct?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POIgnorance OR bug on PHP's "foreach" construct?
    primarykey
    data
    text
    <p>I have a dataset obtained from MySQL that goes like this:</p> <pre> Array ( [0] => Array ( [views] => 14 [timestamp] => 06/04 [views_scaled] => 4.9295774647887 [unix_time] => 1239022177 ) [1] => Array ( [views] => 1 [timestamp] => 19/04 [views_scaled] => 0.35211267605634 [unix_time] => 1240194544 ) ... ... ... ) 1 </pre> <p>(it's post-processed, 'timestamp' was really a timestamp before, but that doesn't matter anyways)</p> <p>The array is stored on <code>$results</code>, and in the middle of my code I do something like this:</p> <pre> $results = array_merge($results, $new_days); $a = $results; foreach ($results as $row) { $unix_time[] = $row['unix_time']; } $b = $results; </pre> <p><b>The problem:</b> <code>$a</code> and <code>$b</code> are both different. The first one shows the array as it's supposed to, and the second one has the same <code>count()</code>, but it's fourth element is a duplicate from the last one. As far as I know, I'm not passing anything by reference, so <code>$results</code> Isn't meant to change (maybe the pointer, but not it's content). I'm using PHP 5.2.4 on Mac OS X 10.5.2.</p> <p><b>The obvious question:</b> Is this somehow the intended behavior, a bug or I'm doing something wrong here? (not a boolean answer please ;) <hr /> <b>EDIT:</b> Thank you all for the interest, I don't know exactly how much extra code should I post, I don't do much before except for retrieving the data from the DB and a <code>foreach</code> to parse the timestamp and build a new array (<code>$new_days</code>) for the missing days. This is all working fine.</p> <p>This code goes after the one I've posted early:</p> <pre> array_multisort($unix_time, SORT_ASC, $results); $days = implode('|', array_pluck('timestamp', $results)); $views = implode('|', array_pluck('views', $results)); $views_scaled = implode(',', array_pluck('views_scaled', $results)); </pre> <p>(<code>array_pluck()</code> is a custom function to generate an array from a column in a typical DB-dumped dataset) <hr /> <b>EDIT 2:</b> Thanks again, here's <a href="http://snipplr.com/view/14259/ignorance-or-bug-on-phps-foreach-construct/" rel="nofollow noreferrer">the full snippet</a> and the output from the <code>$results</code> array <a href="http://snipplr.com/view/14257/" rel="nofollow noreferrer"><code>$a</code></a> and <a href="http://snipplr.com/view/14258/" rel="nofollow noreferrer"><code>$b</code></a> (also referenced in the code's comments).</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USlima
    1. USlima
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POIgnorance OR bug on PHP's "foreach" construct?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POIgnorance OR bug on PHP's "foreach" construct?
      1. USLouis
      1. VTFavorite
    3. VO
      singulars
      1. POIgnorance OR bug on PHP's "foreach" construct?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThat is definitely not the intended behavior of the code you've included. And it's not a bug in foreach, either. You should show use the _exact_ code you're using between $a = $results; and when you finally print $a and $b.
      singulars
      1. POIgnorance OR bug on PHP's "foreach" construct?
      1. USCalvin
    2. COThat my friend, as weird as it may sound, IS the ~exact code. I used exit(print_r()) on each point I represented with a variable in this code ($a and $b).
      singulars
      1. POIgnorance OR bug on PHP's "foreach" construct?
      1. USlima
    3. COWhat is the contents of $new_days, what function do you use to parse the timestamp. Can we see code used to foreach the timestamps. What happens to anything you do to the array before you see its output. Can you put prints of the arrays straight after this section you have shown us so far?
      singulars
      1. POIgnorance OR bug on PHP's "foreach" construct?
      1. USLouis
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload