Remove element from array

phreak

Ok, this is probably simple but I can't figure out how to do it for the life of me. In my code below, I assign questions, question IDs, and answers to different arrays. Here is the code for that:

while($query2 = $db->fetch_array($query)) {
  $arrQuestionID[] = $query2['intQuestID'];
  $arrQuestion[] = $query2['varcQuestion'];
  $arrAnswer[] = $query2['varcAnswer'];
}

Later on down the page I have the following code that grabs how many questions are in the $arrQuestion[] array, and then randomly picks a question ID from $arrQuestionID by key.

$y = sizeof($arrQuestion);
$y--;
mt_srand((double)microtime()*1000000);
$y = mt_rand(0, $y);
$arrQuestionID[$y];

So my question is, how can I remove the question element from the $arrQuestion[] array and the question ID element from the $arrQuestionID[] array? I want to do this so that if there are 8 questions in the array and everything is randomly picked, the same question doesn't get randomly picked again.

Thanks for your help.

phreak

zhabala

You mean this ?

<?php

$arrTest = array ( "one", "two", "three", "four" );

print_r($arrTest);
echo "<BR>";

$index = 0;

array_splice($arrTest,$index,1);

print_r($arrTest);
echo "<BR>";

?>

Zdenek

phreak

Thanks a bunch... but does that take everything out of the array that is in front or back of it? Because if I have 4 elements in the array that it counts, shouldn't I be able to view 4 questions before I run into nothing? Because sometimes it will only give me 1 question and then everything will be gone from the array.

Phreak

zhabala

The description of array_splice is:

array array_splice ( array input, int offset [, int length [, array replacement]])

so the first parametr is from which array you will delete
second is the offset (position - $y in your script)
third is how many items will be removed (if this one is ommited then it will delete the part of array from an offset to the end of array

Zdenek