Question

Array to JSON json_encode

Asked by: narmi2

Dear Experts,

If I wanted the json_encode to return this:

var cart = {
    "group1" : {
            "001" : { "item" : "item 1", "value" : 1, "qty" : 1 },
            "010" : { "item" : "item 2", "value" : 2, "qty" : 2 },
            "011" : { "item" : "item 3", "value" : 3, "qty" : 3 }
    },
    "group2" : {
            "001" : { "item" : "item 4", "value" : 1, "qty" : 1 },
            "010" : { "item" : "item 5", "value" : 2, "qty" : 2 },
            "011" : { "item" : "item 6", "value" : 3, "qty" : 3 }
    },
        "group3" : {
            "001" : { "item" : "item 7", "value" : 1, "qty" : 1 },
            "010" : { "item" : "item 8", "value" : 2, "qty" : 2 },
            "011" : { "item" : "item 9", "value" : 3, "qty" : 3 }
    }
};

What would the PHP array look like?

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Asked On
2009-10-30 at 08:42:33ID24858445
Topics

PHP Scripting Language

,

JSON

Participating Experts
1
Points
500
Comments
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Answers

 

by: LordZardeckPosted on 2009-10-30 at 08:52:57ID: 25704166

Its very easy, all you do is match your array associations.

Now, someone correct me if the following code is wrong. I haven't tested it, but it should be what you want.

$groups["group1"]["001"] = Array("item"=>"item1", "value"=>"1", "qty"=>"1");
$groups["group1"]["010"] = Array("item"=>"item2", "value"=>"2", "qty"=>"2");
$groups["group1"]["011"] = Array("item"=>"item3", "value"=>"3", "qty"=>"3");
 
$groups["group2"]["001"] = Array("item"=>"item4", "value"=>"4", "qty"=>"4");
$groups["group2"]["010"] = Array("item"=>"item5", "value"=>"5", "qty"=>"5");
$groups["group2"]["011"] = Array("item"=>"item6", "value"=>"6", "qty"=>"6");
 
$groups["group3"]["001"] = Array("item"=>"item7", "value"=>"7", "qty"=>"7");
$groups["group3"]["010"] = Array("item"=>"item8", "value"=>"8", "qty"=>"8");
$groups["group3"]["011"] = Array("item"=>"item9", "value"=>"9", "qty"=>"9");
 
$output = "var cart = ".json_encode($groups).";";
 
echo $output.

                                              
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by: LordZardeckPosted on 2009-10-30 at 08:56:53ID: 25704223

Also, as a bit of extra information, I would sometimes like to output mysql results as json for ajax applications (although there is a MUCH better way of doing it, and I no longer use the mysql side of this function, for someone just starting out with json this could be helpful). In which case, you cannot just pass a mysql query to json_encode(). Here is the function that I used:

function getJSON($resource){
          
          if(is_resource($resource)){
              while($r = self::$db->fetch_row($resource)) {
                $rows[] = $r;
              }
 
              
              $encoded = json_encode($rows);
          }else{
          
              $encoded = json_encode($resource);
              
          }
          
          return $encoded;
      
      }

                                              
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by: narmi2Posted on 2009-11-01 at 01:52:41ID: 25713153

Could you please explain your first post?  I don't understand it.

 

by: LordZardeckPosted on 2009-11-01 at 14:42:33ID: 25715965

Okay, you can basically look at your json array as an outline for your php arrays as follows:
I. groups
  1. Group1
     A. 001
        1. item
        2. value
        3. qty
     B. 010
        1. item
        2. value
        3. qty
     C. 011
        1. item
        2. value
        3. qty
  2. Group2
.....
And so on a so forth. Now, imagine it in php:
I. $groups
  1. $groups["group1"]
     A. $groups["group1"]["001"]
        1. $groups["group1"]["item"]
        2. $groups["group1"]["value"]
        3. $groups["group1"]["qty"]
....
And so on. My code just shortened a1, a2, and a3 into an array code :

Array("item"=>"item1", "value"=>"1", "qty"=>"1");

The => part is a symbol meaning key=>value, similar to:

$array[key] = value;

Does that help?

 

by: narmi2Posted on 2009-11-02 at 01:44:25ID: 31648071

Thanks

 

by: narmi2Posted on 2009-11-02 at 01:52:33ID: 25718126

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