how to choose ONLY certain value in an array? ($count[0] doesn't work)

[et4891]

not sure how to explain this perfectly but I had some help from others earlier then I started thinking more and having more questions while I fool around with the codes…
I’m creating something like voting system and saves the data in data.json since I’m just fooling around and heard using json is a good simple way to start so I didn’t create a database and so on.
my index page was just a two radio buttons to choose and then submit then the data stores into data.json and here is the example of my data.json

{"type":"left"} {"type":"left"} {"type":"right"}
I got some help from few super nice people to figure out how I can run script and count how many left and how many right but then now I got another idea is if I only want to show how many left or only how many right or if I added more into the option and I only want a few certain # to show instead of all.
for example there are two left being submitted and I only want to show 2 instead of showing
left 2
right 1
I only want to show 2 for I don’t know what reason or just show 1 maybe to explain different thing or blah…
here is my code to count how many left and right

$file = file('data.json');          // each line gets added to the $file array
 
$votes = array();                   // initiate $votes to an array
foreach($file as $line) {
$vote = json_decode($line, true);   // json decode current line

$key = $vote['type'];               // use the vote as the key
if(isset($votes[ $key ]))           // check if current vote exits. If it does increment vote by 1
    $votes[ $key ]++;
else                                // vote doesn't exist yet. Add vote to votes (creates new key). Initiate vote with 1
    $votes[ $key ] = 1;
}
 
echo "<h1>Vote Results</h1>";
foreach($votes as $vote => $count)
{
    echo "<b>$vote</b> has $count votes<br />";
}

I tried something like $count[0] and things like that which is how we normally recall a certain string in an array but $count[0] $votes[0] $vote[0].

Can someone give me a hand? Really thanks…

[JimL]

When you set an array key ($votes[ $key ]) you must use this key to fetch it again. Example:
[php]<?php
$array = array();
$array[] = ‘foo’;
echo $array[0]; //prints foo

$array[‘bar’] = 123;
echo $array[‘bar’]; // prints 123[/php]

[hr]

For this task I would really do something like this:

store a json like this:
[php]{“alternatives”:{“left”:0,“right”:0},“votes”:[]}[/php]

Then I would do something like this:
[php]<?php

// this should ofcourse be changed to your user-stuff
$loggedInUser = array(
‘id’ => rand(1000,6000)
);

function getFromStore() {
return json_decode(file_get_contents(‘data.json’));
}

function saveToStore($data) {
file_put_contents(‘data.json’, json_encode($data));
}

if (!empty($_POST[‘vote’])) {
$data = getFromStore();
// Ok, let’s do some voting
if (empty($data->alternatives->$_POST[‘vote’])) {
echo ‘

INVALID VOTE

’;
} else {
$data->alternatives->$_POST[‘vote’]++;
$data->votes[] = array(
‘time’ => date(“Y-m-d H:i:s”),
‘userId’ => !empty($loggedInUser[‘id’]) ? $loggedInUser[‘id’] : ‘Guest’,
‘vote’ => $_POST[‘vote’]
);
saveToStore($data);
// Do a redirect to clear post (if you do not redirect you will resubmit the form if you press F5 / reload.
header(‘Location: http://’ . $_SERVER[HTTP_HOST] . $_SERVER[REQUEST_URI]);
}
}

$data = getFromStore();
rsort($data->votes);
?>

<?php foreach ($data->alternatives as $alternative => $count) { ?> <?= ucfirst($alternative) ?>
<?php } ?>

Vote Results

<?php foreach($data->alternatives as $alternative => $count) { ?> <?= $alternative ?> has <?= $count ?> votes
<?php } ?>

Votes

<?php foreach($data->votes as $vote) { ?> <?= $vote->time ?> : User <?= $vote->userId ?> voted <?= $vote->vote ?>
<?php } ?>[/php]

Output:

Vote Results left has 4 votes right has 3 votes

Votes
2013-09-25 08:43:38 : User 4455 voted left
2013-09-25 08:43:36 : User 1805 voted left
2013-09-25 08:43:34 : User 4183 voted right
2013-09-25 08:40:58 : User 3932 voted right
2013-09-25 08:40:03 : User 5315 voted left
2013-09-25 08:39:58 : User 4238 voted right
2013-09-25 08:39:53 : User 3823 voted left

JSON store now looks like this:

{ "alternatives": { "left": 4, "right": 3 }, "votes": [ { "time": "2013-09-25 08:39:53", "userId": 3823, "vote": "left" }, { "time": "2013-09-25 08:39:58", "userId": 4238, "vote": "right" }, { "time": "2013-09-25 08:40:03", "userId": 5315, "vote": "left" }, { "time": "2013-09-25 08:40:58", "userId": 3932, "vote": "right" }, { "time": "2013-09-25 08:43:34", "userId": 4183, "vote": "right" }, { "time": "2013-09-25 08:43:36", "userId": 1805, "vote": "left" }, { "time": "2013-09-25 08:43:38", "userId": 4455, "vote": "left" } ] }

[et4891]

<?php $array = array(); $array[] = 'foo'; echo $array[0]; //prints foo $array['bar'] = 123; echo $array['bar']; // prints 123

ah ok I get what you mean now but when I use echo $votes[ $key ]; only 7 is printed instead of saying it’s an array how can I then only print the vote 3 then?
Sorry I’m still quite new…and always when I’m stuck my brain just feels like it’s clogged even if it’s some simple thing it’s just clogged and won’t open up easily
seeing your $array['bar'] example I used $votes[ $key ] to give it a try and 7 is printed I thought an array will show and say it’s an array that I have to do something like $votes[ $key ][0] for 7 to be printed but I’m wrong again

[JimL]

It’s kinda hard to understand what you mean. You can’t echo an array, echoing an array key will always give you the value assigned to that key. Doing a foreach and breaking up arrays into key => value should work (like you do)

This works perfectly:
[php]<?php
$array = array(
‘test1’ => 7,
‘test2’ => 8,
‘test3’ => 9
);

foreach ($array as $alt => $votes) {
echo $alt . ’ has ’ . $votes . ’ votes
’;
}[/php]

Output:

test1 has 7 votes test2 has 8 votes test3 has 9 votes
[hr]

If you are having trouble you just have to start debugging, either with tools or by trying to var_dump your arrays/values.

Tip: adding a pre tag makes reading dumps much easier. Compare:
[php]<?php
$array = array(
‘test1’ => 7,
‘test2’ => 8,
‘test3’ => 9
);

var_dump($array);

echo ‘

’;

var_dump($array);[/php]
Output:
[code]array(3) { [“test1”]=> int(7) [“test2”]=> int(8) [“test3”]=> int(9) }
array(3) {

[“test1”]=>

int(7)

[“test2”]=>

int(8)

[“test3”]=>

int(9)

}[/code]

[JimL]

Oh man, I’ve spent way too much time on this now… But this works, kinda fun to work with something non-oop again (even though I could hardly resist converting it)

Note: if you try this you should change isAdmin to true to get the admin controls.

[php]<?php

// this should ofcourse be changed to your user-stuff
$loggedInUser = array(
‘id’ => rand(1000,6000),
‘isAdmin’ => false
);

/********************************************************

• Functions
  ********************************************************/

function getFromStore() {
return json_decode(file_get_contents(‘data.json’));
}

function saveToStore($data) {
file_put_contents(‘data.json’, json_encode($data));
// Do a redirect to clear post (if you do not redirect you will resubmit the form if you press F5 / reload.
header(‘Location: http://’ . $_SERVER[HTTP_HOST] . $_SERVER[REQUEST_URI]);
}

function vote($vote, $userId = ‘Guest’) {
$data = getFromStore();
// Ok, let’s do some voting
if (!isset($data->alternatives->{$vote})) {
echo ‘

VOTE ALTERNATIVE DOES NOT EXIST

’;
} else {
$data->alternatives->$vote++;
$data->votes[] = array(
‘time’ => date(“Y-m-d H:i:s”),
‘userId’ => $userId,
‘vote’ => $vote
);
saveToStore($data);
}
}

function createAlternative($alternative) {
$data = getFromStore();
if (isset($data->alternatives->$alternative)) {
echo ‘

ALTERNATIVE ALREADY EXIST

’;
}
$data->alternatives->$alternative = 0;
saveToStore($data);
}

function deleteAlternative($alternative) {
$data = getFromStore();
if (!isset($data->alternatives->$alternative)) {
echo ‘

ALTERNATIVE DOESN’T EXIST

’;
}
unset($data->alternatives->$alternative);
saveToStore($data);
}

function deleteVotes() {
$data = getFromStore();
foreach ($data->alternatives as $alternative => $value) {
$data->alternatives->$alternative = 0;
}
$data->votes = array();
saveToStore($data);
}

/********************************************************

• Logic
  ********************************************************/

$errors = array();

if (!empty($_POST[‘vote’])) {
vote($_POST[‘vote’], $loggedInUser[‘id’]);
}

if (!empty($_POST[‘create_alternative’]) && $loggedInUser[‘isAdmin’]) {
createAlternative($_POST[‘create_alternative’]);
}

if (!empty($_POST[‘delete_alternative’]) && $loggedInUser[‘isAdmin’]) {
deleteAlternative($_POST[‘delete_alternative’]);
}

if (!empty($_POST[‘delete_votes’]) && $loggedInUser[‘isAdmin’]) {
deleteVotes();
}

/********************************************************

• View
  ********************************************************/
  $data = getFromStore();
  rsort($data->votes);
  ?>

<?php if (count(get_object_vars($data->alternatives)) < 1) { ?>

No alternatives registered

<?php } else { ?> <?php foreach ($data->alternatives as $alternative => $count) { ?> <?= ucfirst($alternative) ?>
<?php } ?> <?php } ?>

Vote Results

<?php foreach($data->alternatives as $alternative => $count) { ?> <?= $alternative ?> has <?= $count ?> votes
<?php } ?>

Votes

<?php foreach($data->votes as $vote) { ?> <?= $vote->time ?> : User <?= $vote->userId ?> voted <?= $vote->vote ?>
<?php } ?> <?php if (empty($data->votes)) { ?>

No votes yet

<?php } ?> <?php if ($loggedInUser['isAdmin']) { ?>

Admin stuff

<?php foreach($data->alternatives as $alternative => $count) { ?> <?= ucfirst($alternative) ?> <?php } ?> <?php } ?>[/php]

---

[et4891]

It’s kinda hard to understand what you mean. You can’t echo an array, echoing an array key will always give you the value assigned to that key. Doing a foreach and breaking up arrays into key => value should work (like you do)

ah sorry for my poor english. Earlier I was just trying to try and create a script like my first post which is completed. But now I have another idea is that if I’m doing a 2d canvas pie chart to draw the percentage. I already figured how the 2d canvas can be done but I only need the votes of the left/right.

so let’s say if left have 3 votes and right has 1 votes but I need only the 3 and 1 value to carry into the variables I’m using in the 2d canvas to draw the piechart.

that’s why I want to try and only echo the number one by one.
Hopefully I’m making this more clear what I want to try. Sorry for any confusions.

[JimL]

This echoes both key and value:
[php]<?php
$array = array(
‘test1’ => 7,
‘test2’ => 8,
‘test3’ => 9
);

foreach ($array as $alt => $votes) {
echo $alt . ’ has ’ . $votes . ’ votes
’;
}[/php]

If you only need values:
[php]<?php
$array = array(
‘test1’ => 7,
‘test2’ => 8,
‘test3’ => 9
);

foreach ($array as $votes) {
echo $votes . ‘
’;
}[/php]

For a chart you could probably also do this and insert it straight into the chart settings:
[php]<?php
$array = array(
‘test1’ => 7,
‘test2’ => 8,
‘test3’ => 9
);

echo implode(’,’, $array); // 7,8,9[/php]

[et4891]

ah ok…I will try echo implode(',', $array); // 7,8,9 tomorrow or something because I think this is what I didn’t try yet but the thing is…
for the previous samples you gave me for echoing both key and value and echo only values, I totally understand how those sample works but just somehow when I’m trying to get like what I said before and by using your example

[code] <?php
$array = array(
‘test1’ => 7,
‘test2’ => 8,
‘test3’ => 9
);

foreach ($array as $votes) {
  echo $votes . '<br />';

}[/code]

I only want to get the number 8 from test2 and nothing else so I try to pass (not sure I know how it can be done yet) value 8 into the chart’s calculation.

[JimL]

[code] <?php
$array = array(
‘test1’ => 7,
‘test2’ => 8,
‘test3’ => 9
);

foreach ($array as $votes) {
  echo $votes . '<br />';

}[/code]

I only want to get the number 8 from test2 and nothing else so I try to pass (not sure I know how it can be done yet) value 8 into the chart’s calculation.

Then do:
[php]echo $array[‘test2’];[/php]

As I said in my original answer.

[quote author=JimL link=topic=21514.msg74353#msg74353 date=1380091725]
When you set an array key ($votes[ $key ]) you must use this key to fetch it again. Example:
[php]<?php
$array = array();
$array[] = ‘foo’;
echo $array[0]; //prints foo

$array[‘bar’] = 123;
echo $array[‘bar’]; // prints 123[/php]

[et4891]

JimL>

OMG thanks OMG what was I thinking!
arg >.<"

Thanks a lot…

P.S. is there a way to say this forum is solved or give you a thumbs up? Sorry totally new in this forum.

[JimL]

P.S. is there a way to say this forum is solved or give you a thumbs up? Sorry totally new in this forum.

I marked it as answered for you Think you need more posts/points/whatever to unlock some more features.

[et4891]

I marked it as answered for you Think you need more posts/points/whatever to unlock some more features.

again thanks for the help. I kept on thinking I tried that too, I guess I tried that with the wrong variable or something gosh…took me hours to figure out and asking around. Thanks thanks

[et4891]

ah~! not sure if you are still reading this post but one more stupid question that I kept on forgetting to ask…for the examples…left right up were used and as I said I was trying to bring the result and make it into a pie chart. I kept forgetting to ask what if in my json there were only left and right data in it without up then when I open up the data.json up weren’t there I need to find a way to set it so if some exist value is not inside the data then the value is 0.