How to output part of a multidimensional array?

Question

I have tried to echo out an image from an array, but it did not work.

$productArr = [
    "PT" => [
        "cat" => [ "image" => "cat.jpg", "desc" => "blah blah"],
        "fish"=> [ "image" => "fish.jpg", "desc" => "blah blah"],
        "dog" => [ "image" => "dog.jpg","desc" => "blah blah"],
    ],
    "KC" => [
        "Ice" => [ "image" =>   "ice.jpg", "desc" => "mah mah mah"],
        "cold"=> [ "image" => "cold.jpg", "desc" => "mah mah mah"],
        "water"=> [ "image" =>   "water.jpg", "desc" => "mah mah mah"],
    ],

];

$featuredArr = [
    "KC" => "Ice",
    "PT" => "cat",
];

foreach ($featuredArr as $key => $value) {
   if ($productArr[$key][$value]) {
      echo "key $key=>$value exists:  <br />";
      foreach ($productArr[$key][$value] as $newKey => $newValue) {
         echo "$newKey['image']<br />";
      }
   }
}

I also want it to echo out Both "KC" and "PT" from $featuredArr. currently only "Cat" is being outputted.

You have a syntax error. echo "$newKey['image']<br />"; should be echo "{$newKey['image']}<br />";. How is it running at all? — Barmar
– Barmar, Commented Jan 2, 2015 at 12:14

Shitiz Garg · Accepted Answer · 2015-01-02 12:15:54Z

1

$productArr[$key][$value] is already a 1-D array, for KC => Ice it holds the value:

[ "image" =>   "ice.jpg", "desc" => "mah mah mah"]

You have to simply output

echo $productArr[$key][$value]['image'], "<br />";

Also, you should use isset() or empty() to check whether to element exists such as:

if (isset($productArr[$key]) && isset($productArr[$key][$value]))

this prevents undefined index errors.

answered Jan 2, 2015 at 12:15

Shitiz Garg

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Comments

Erik · Accepted Answer · 2015-01-02 12:16:33Z

0

The inner foreach loop is unneccesary and doing strange things. Try running this, it seems to work:

$productArr = [
    "PT" => [
        "cat" => [ "image" => "cat.jpg", "desc" => "blah blah"],
        "fish"=> [ "image" => "fish.jpg", "desc" => "blah blah"],
        "dog" => [ "image" => "dog.jpg","desc" => "blah blah"],
    ],
    "KC" => [
        "Ice" => [ "image" =>   "ice.jpg", "desc" => "mah mah mah" ],
        "cold"=> [ "image" => "cold.jpg", "desc" => "mah mah mah" ],
        "water"=> [ "image" =>   "water.jpg", "desc" => "mah mah mah" ],
    ],

];

$featuredArr = [
    "KC" => "Ice",
    "PT" => "cat",
];

foreach ($featuredArr as $key => $value) {
   if ($productArr[$key][$value]) {
      echo "key $key=>$value exists:  <br />";
      echo $productArr[$key][$value]['image'] . '<br />';
   }
}

You can quickly test stuff like this using a PHP repl site, like this one:

http://phpepl.herokuapp.com/

answered Jan 2, 2015 at 12:16

Erik

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3 Comments

Jun Over a year ago

in my system, it only produced key PT=>cat exists: cat.jpg

Erik Over a year ago

Sounds like a problem on your system then, do you have all error reporting active? It might be there is some sort of problem your system is supressing. Does it work when you run this code on the REPL I linked?

Jun Over a year ago

i found the reason why, i cannot have the same key value in my $featuredArr

Akash kumar · Accepted Answer · 2015-01-02 12:17:36Z

Not exactly to your question but I think my slider example may help you, please keep few image with name image1.jpg image2.jpg.... in same folder

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>

<style>
#cycler{position:relative;}
#cycler img{position:absolute;z-index:1}
#cycler img.active{z-index:3}
</style>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

<script>

function cycleImages(){
      var $active = $('#cycler .active');
      var $next = ($active.next().length > 0) ? $active.next() : $('#cycler img:first');
      $next.css('z-index',2);//move the next image up the pile
      $active.fadeOut(1500,function(){//fade out the top image
      $active.css('z-index',1).show().removeClass('active');//reset the z-index and unhide the image
          $next.css('z-index',3).addClass('active');//make the next image the top one
      });
    }

$(document).ready(function(){
// run every 7s
setInterval('cycleImages()', 2000);
})

</script>


</head>

<body>

<div id="cycler">
<img class="active" src="image1.jpg" alt="My image" />
<img src="image2.jpg" alt="My image" /> 
<img src="image3.jpg" alt="My image" /> 
<img src="image4.jpg" alt="My image" />     
</div>

</body>
</html>


</html>

Barmar · Accepted Answer · 2015-01-02 12:17:55Z

0

You're echoing the wrong thing in the inner foreach loop. You should be echoing the key and value, but you're indexing the key.

foreach ($featuredArr as $key => $value) {
   if ($productArr[$key][$value]) {
      echo "key $key=>$value exists:  <br />\n";
      foreach ($productArr[$key][$value] as $newKey => $newValue) {
         echo "$newKey => $newValue<br />\n";
      }
   }
}

DEMO

answered Jan 2, 2015 at 12:17

Barmar

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