CODEWITHSUNDEEP
phpjson
WXR
WXR

Reputation: 591

how to make data not in json value 0?

I'm really sorry for my bad title because I don't know how to shorten my question. I had a bit help earlier with the thing I'm trying at the moment but then now I'm stuck again and couldn't get out of my box again. Helpfully someone can give me a hand.

the codes are a bit too long so hopefully by just wordings would work give out an idea what I want.

ok so I'm having a form with let's say radio button of left right up and let's people choose then submit. I then used the # of votes / sum of votes and input it into pie chart. I then realized if no one voted for either left/right/up or let's say if one of them isn't being voted YET then I will get an error because the data isn't even in my data.json file.

So if the value/data isn't in data.json YET how can I make the certain option (left/right/up) 0?

Sorry for my bad english but hopefully you can understand what I'm trying to ask.....

here are my codes....of course I skipped posting the body, html tag and stuffs...

in my index.php

<form action="store.php" method="post">

<?php

$music_type = array("pop", "rock", "metallic");

foreach($music_type as $type)
{
    echo $type . '<input type="radio" name="type" value='. $type . '>' . '<br>' . PHP_EOL;
}
?>

in my store.php

 <?php
 $file_handle = fopen('data.json', 'a');  
 if($file_handle) {                       
    fwrite(                              
      $file_handle,                     
      json_encode($_POST).PHP_EOL       
      );      
   fclose($file_handle);                 
}
else {
   echo 'Error opening data file.';      
}

$file = file('data.json');          // each line gets added to the $file array

$votes = array();                   // initiate $votes to an array

foreach($file as $line)
{
    // json decode current line
    $vote = json_decode($line, true);   

    // use the vote as the key
    $key = $vote['type'];

    // check if current vote exits. If it does increment vote by 1
    if(isset($votes[ $key ]))
    {
        $votes[ $key ]++;
    }   
    // vote doesn't exist yet. Add vote to votes (creates new key). Initiate vote with 1       
    else
    {
        $votes[ $key ] = 1;
    }

}

echo "<h1>Vote Results</h1>";

foreach($votes as $vote => $count)
{
    echo "<b>$vote</b> has $count votes<br />";
}


  $sum = $votes['metallic'] + $votes['pop'] + $votes['rock'];

  $circle_degree = 360;

  $metallic_pie = $votes['metallic'] / $sum * $circle_degree;

  $pop_pie = $votes['pop'] / $sum * $circle_degree;

  $rock_pie = $votes['rock'] / $sum * $circle_degree;
?>

<canvas id="piechart1" width="400" height="400"></canvas>
<script>
   piechart("piechart1", ["cyan", "yellow", "green"], [ <?php echo $metallic_pie;?>,
                                                        <?php echo $pop_pie;?>,
                                                        <?php echo $rock_pie;?>]);
</script>

and let's say in my data.json only 

{"type":"rock"}
{"type":"metallic"}
{"type":"metallic"}

I know some people say this is not valid json but then I believe from my previous post someone told me because I'm using radio instead of checkbox and so on but my real question is since my json only contains and these {"type":"rock"} {"type":"metallic"} exists and NOT {"type":"pop"} How can I make pop with value of 0. Without {"type":"pop"} even exist in data.json php isn't recalling anything inside json.

Hopefully you understand what my question is and again really sorry for my poor explanation and english

Upvotes: 0

Views: 212

Answers (1)

Steven
Steven

Reputation: 6148

Change:

$sum = $votes['metallic'] + $votes['pop'] + $votes['rock'];

$circle_degree = 360;

$metallic_pie = $votes['metallic'] / $sum * $circle_degree;

$pop_pie = $votes['pop'] / $sum * $circle_degree;

$rock_pie = $votes['rock'] / $sum * $circle_degree;

To:

$voteM = (empty($votes['metallic'])) ? 0 : (int)$votes['metallic'];
$voteP = (empty($votes['pop']))      ? 0 : (int)$votes['pop'];
$voteR = (empty($votes['rock']))     ? 0 : (int)$votes['rock'];
$sum   = $voteM + $voteP + $voteR;

$circle_degree = 360;
$metallic_pie  = $voteM / $sum * $circle_degree;
$pop_pie       = $voteP / $sum * $circle_degree;
$rock_pie      = $voteR / $sum * $circle_degree;

Upvotes: 1

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