I am creating a small PHP quiz and I have a Multidimensional Array set up (which houses my question titles and questions), I then use rand_array to chose one of the arrays and display it into my page. After it has been displayed I use unset($row); to remove it from my Multidimensional Array so that the same question is never shown twice.
There are three buttons (for the three answers) and when that is clicked it will give 0, 10 or 20 points to the user. I have used this to get the points back:
if (isset($_POST["Answer1"])){
$points = $points + 20;
initialQuestions();
}
I run initialQuestions(); again to get the next question but this obviously resets my entire array, how do I make it skip to the next question with the previous item removed from the array eventually leading it to be a blank array?
Any help would be much appreciated.
use array splice instead of unset cause the vallue gets nulled but the key remains
initialQuestions()? And where is Your array?
use initialQuestions($question_array) and return array without current question;
Something like this
$questions = array('your array');
function initialQuestions($questions) {
//get some question
//remove it from array
return $questions;//return this array
}
then
if (isset($_POST["Answer1"])){ $points = $points + 20; $questions = initialQuestions($questions);
or globalize $questions array
function initialQuestions() {
global $questions;
//get some question
//remove it from array
}
But best for me is using $_SESSION to store Your $question array.
you can just randomly pull a question from the all_question array, and save this 'used' question into Session, then doesn't matter what you do in the POST back, the next time when you pull a 'next' question from all_question, you just check it see if it's already stored in the 'used' Session, if so, pull again, if not, you got what you want.
<?php
session_start();
$all_question = array(
//put all your question here...
);
//pull a question out
$new_question = pull_question( $all_question );
//save this question to the 'used' session
$_SESSION['used_question'][] = $new_question;
?>
Related
I'm receiving this array of objects and need to iterate over it, but the problem is that I need to get the value of the next item when its iterating, to compare the value of the current object with the next one, and if it's a different value, split this array in two.
So, I was doing it with next() php function:
//looking for the next register in the array
$next = next($finances);
//first array if exist different values
$aiuaEd = [];
//second array if exist different values
$aiua = [];
foreach ($finances as $finance) {
if ($finance->cnpj <> $next->cnpj) {
$aiua[] = $finance;
} else {
$aiuaEd[] = $finance;
}
}
This code works fine at some point, but then I got this error:
Trying to get property 'cnpj' of non-object in
I don't know why sometimes works well and sometimes don't, debugging this variables, I found that if my array have 2 objects inside only, when I'm looping over it, the $next->cnpj variable came as empty, and sometimes don't.
Can someone help me with this?
I solved it with a different approach, instead of using php next(), I first loop over this array saving the cnpj's into an array.
$cnpjs = [];
foreach($finances as $finance){
$cnpj[] = $finance->cnpj;
}
Then I use array_unique() to group this 2 differents CNPJ's and sort() to get the correct keys order.
//grouping cnpjs as unique, should exist only 2 keys
$cnpj = array_unique($cnpj);
//sort array keys to get in order
sort($cnpj);
Then I iterate over my $finances array again, but now I'm counting if this $cnpj array has more than 2 positions, which means that I have to split this data in two differents arrays.
foreach($finances as $finance){
if(count($cnpj) > 1){
if($finance->cnpj == $cnpj[1]){
$aiua[] = $finance;
}else{
$aiuaEd[] = $finance;
}
}else{
$aiuaEd[] = $finance;
}
}
I'm pretty sure that this is not the best approach for that problem, or at least the most optimized one, so I'm open for new approach's suggestions!
Just posting how I solved my problem in case anyone having the same one.
Notice that this approach is only usable because I know that will not exist more than 2 different's CNPJ's in the array.
I had a problem with my array_push, that i noticed.
So what i'm doing.:
I have a site, where there are some buttons with a specific value.
Each value is getting fetched from a database.
I have a session called test, that get's converted to an array(to store multiple in the same array)
Everytime one of the buttons are clicked, the value for that specific button, is getting pushed to the array.
But, i can ONLY see that it has been pushed at the second try.
[test] => Array( [0] => 21304 )
This is what i see, after second try. But my array count, says that there are 2 elements, in that array.
Here is my code:
if(isset($_POST['process'])) {
if(!isset($_SESSION['test'])) {
$_SESSION['test'] = array();
$array_merge = array_push($_SESSION['test'], $_POST['process']);
}
}
The $_POST['process'] is the button with the unique value.
Can somebody maybe see what I'm doing wrong here?
Kind regards
You are only adding to the $_SESSION['test'] array if $_SESSION['test'] was not previously set.
So you need to always add an occurance to the session array and only initialise the session array if it was not previously set
session_start();
// ...
if(isset($_POST['process'])) {
if(!isset($_SESSION['test'])) {
$_SESSION['test'] = array();
}
$_SESSION['test'][] = $_POST['process'];
}
NOTE from the manual
If you use array_push() to add one element to the array, it's better to use $array[] = because in that way there is no overhead of calling a function.
I have an array which contains sets of three similar named items; however, sometimes there's only two items in a set and I want to call these out.
<?php
$items = array(
'reviewpitfighter-1.138x88.jpg',
'reviewpitfighter-2.138x88.jpg',
'reviewpopfulmailsegacd-1.138x92.jpg',
'reviewpopfulmailsegacd-2.138x76.jpg',
'reviewpopfulmailsegacd-3.138x97.jpg'
);
?>
You'll note that there are two reviewpitfigher* items, and three reviewpopfulmailsegacd* items. I've started down a rabbit hole of loops and feel that there is something simple I'm just glossing over.
May be you can do this as a 2 stage process.
Stage 1:
Loop through the original array and form another set of array with its key as the value of this original array. Then save the repetition count in each of those new arrays.
Stage 2:
Loop through the new set of arrays and then pick out the arrays which has values less than 3 and retrieve its key.
Hope this helps!!
Here's the solution I came up with, sorry it took so long to post.
foreach($images as $value){
$lastItem = explode('-', $images[$count - 1]);
$parts = explode('-', $value);
if(preg_match('/^1/', $parts[1]) && $count != 0){
if(preg_match('/^2/',$lastItem[1])){
$imgurl = preg_replace('/^p?review/','',$lastItem[0]);
$sql = 'SELECT field FROM table WHERE field = "' . $imgurl . '"';
$result = $dbConn->FetchArray($dbConn->Query($sql), MYSQL_ASSOC);
$array[$imgurl] = $result;
}
}
$count++;
}
I get an array of all the images, then I check to see if I'm looking at the first image, if I am then I see if the last image I looked at was the second image. At this point I then call into the database to get some information to display a neatly messaged out put of what reviews are missing a third image. In the end $array contains this list which I can loop over.
I am currently building a questionnaire system which spans over multiple steps (pages). I am using an assoc array which is stored in session to store the submitted answers.
I am having problems getting my head around how I would build this up programmatically.
The array should be as follows
array(STEP => array(ANSWER 1, ANSWER 2, ANSWER 3, etc...));
I have the step as a variable '$step' and the answer array is built up as a separate '$answers' variable.
So basically what I need to be able to build up is the following
array($step => $answers);
$_SESSION["answers"][$step] = array($ANSWER1, $ANSWER2, <other answers>);
It'd be up to you to define $step and the $ANSWERn variables, of course. And properly initializing your session, too.
After the questionnaire, you'd just step through your array to extract all the answers:
foreach($_SESSION["answers"] as $step => $answer) {
// magic happens here
}
(edit: I slightly modified the foreach to give you the $step variable)
$x = array();
$answer = array();
$answer[0]= "A 1";
$answer[1]= "A 2";
$x[$step] = $answer;
Everytime the user visit a page, the page url will be stored into an array session. I want to have 10 elements in the array only. So that 10 elements will save 10 latest visited page urls. Here is my codes :
<?php
$currentpageurl = $_GET['username'];
$urlarray=array();
$urlarray[] = $currentpageurl;
$_SESSION['pageurl']=$urlarray;
foreach($_SESSION['pageurl'] as $key=>$value)
{
echo 'The value of $_SESSION['."'".$key."'".'] is '."'".$value."'".' <br />';
}
?>
I tested the code, it always overwrite the element in the array with new visited page, thus it has only 1 element in the array. How to make it not to overwrite the element?
You are always overwriting the array with a new one here:
$urlarray=array(); // new empty array
$urlarray[] = $currentpageurl;
$_SESSION['pageurl']=$urlarray;
Instead use:
session_start();
// like #Kwpolska said, you probably miss that, so $_SESSION didnt work
is_array($_SESSION["pageurl"]) or $_SESSION["pageurl"] = array();
// fix for your current problem
$_SESSION['pageurl'][] = $currentpageurl;
// This appends it right onto an array.
$_SESSION["pageurl"] = array_slice($_SESSION["pageurl"], -10);
// to cut it down to the last 10 elements
Simplest way to do this and keep just the last 10 entries will be to create your initial array with the correct size (via array_fill()). Then we can push new items onto the beginning of the array and pop old items off the other end using array_unshift() and array_pop().
session_start();
// Initialise URL array with 10 entries.
if (empty($_SESSION['pageurls'])) {
$_SESSION['pageurls'] = array_fill(0,10,'');
}
function trackPage($url) {
array_unshift($_SESSION['pageurls'],$url);
array_pop($_SESSION['pageurls']);
}
Make sure the above code always runs first. Then you can pass new URLs to the array when you want. So, perhaps something like:
trackPage($_SERVER['REQUEST_URI']);
You've ommitted session_start();. Working code (without trimming):
<?php
session_start();
$currentpageurl = $_GET['username'];
$_SESSION['pageurl'][] = $currentpageurl;
foreach($_SESSION['pageurl'] as $key=>$value) {
echo 'The value of $_SESSION['."'".$key."'".'] is '."'".$value."'".' <br />';
}
?>