Change order of a single array element (relative to the others)

Joseph_Sliker

Hi;
suppose I have alist of item names that have been put into an array in a certain order, like so...

Array ( [1] => 39th_3216.JPG [2] => 39th_3216_02.JPG [3] => 39th_3216_03.JPG [4] => 39th_3216_04.JPG [5] => 39th_3216_05.JPG [6] => 39th_3216_06.JPG [7] => 39th_3216_07.JPG [8] => 39th_3216_08.JPG [9] => 39th_3216_09.JPG [10] => 39th_3216_10.JPG [11] => 39th_3216_11.JPG [12] => 39th_3216_12.JPG [13] => 39th_3216_13.JPG [14] => 39th_3216_14.JPG [15] => 39th_3216_15.JPG [16] => 39th_3216_16.JPG [17] => 39th_3216_17.JPG [18] => 39th_3216_18.JPG [19] => 39th_3216_19.JPG [20] => 39th_3216_20.JPG [21] => 39th_3216_21.JPG [22] => 39th_3216_22.JPG [23] => 39th_3216_23.JPG [24] => 39th_3216_24.JPG [25] => 39th_3216_25.JPG )

...so then I genrate a form based on the array that has up and down buttons for each item...

echo"<table border=1 bordercolor=navy>"; // re-order form
foreach($filenames as $ford=>$fname) {
echo "<tr><td>$ford/$shift/$maxorder</td><td>";
if($ford==1) {echo "&nbsp;</td>";} else {
echo "<form method=POST><input type=hidden value=$ford name=moveme><input type=submit name=direction value=\"up\"></td></form>";}
echo "</td><td>";
if($ford!=$maxorder) {
echo "<form method=POST><input type=hidden value=$ford name=moveme><input type=submit name=direction value=\"down\"></td></form>";} else {echo "&nbsp;</td>";}
echo "<td>($ford)$fname</td></tr>";
}
echo"</table>";

what would the script look like that would replace the key in the array (and therefore correct the other array keys to maintain the new order?

Bonesnap

Take a look at the array_splice() and array_slice() functions.

Joseph_Sliker

Okay...I am looking at that stuff and it seems to fit, conceptually, however I don't seem to get how to use it concretely.

Say I have an array like this
$picturenames=Array([0] => "pic0.JPG", [1] => "pic1.JPG", [2] => "pic2.JPG")

and I want to put the middle picture pic1.JPG (element 1) into the first place or the last place relative to the others (ie. the array should now look like this:

$picturenames=Array([0] => "pic1.JPG", [1] => "pic0.JPG",[2] => "pic2.JPG")
or this
$picturenames=Array([0] => "pic0.JPG", [1] => "pic2.JPG",[2] => "pic1.JPG")

Joseph_Sliker

Thanks for the reply but I don't think that will work: the big picture is, I show the user a table of pictures, and give them + and - buttons to move a picture up or down (one step at a time) so as to modify picture order in the table. So I believe I need to change the key for the individual array element (and therefore the keys of the elements that would come before or after the moved element.

I'm thinking the array_splice thing is right...I just don't get how to use it yet.

...still digging.

Joseph_Sliker

Ack! Okay. I think I'm getting it now. I did not know you could refer to the individual elements in the swap(). I will play with this idea. Thanks so much for your patience and detailed reply.