PHP count JSON array

Question

I have searched SO but couldn't find an answer.My PHP script is receiving some JSON by http post that looks like this:

{
"task": [
{
  "task_id": "3",
  "task_due": "Oct 26 11:25",
  "task_completed": "FALSE",
  "task_desc": "fff",
  "task_time": "20131026_112531",
  "task_name": "fff"
},
{
  "task_id": "2",
  "task_due": "Oct 26 11:25",
  "task_completed": "FALSE",
  "task_desc": "rff",
  "task_time": "20131026_112522",
  "task_name": "xff"
},
{
  "task_id": "1",
  "task_due": "Oct 26 11:25",
  "task_completed": "FALSE",
  "task_desc": "fggg",
  "task_time": "20131026_112516",
  "task_name": "ff"
  }
 ]}

As you can see, there are 3 items, but when I turn it into a PHP array object and count the items, I'm returned 1, when it should be 3, here is my PHP code:

$json_tasks = $_POST["json_array"];
$task_array = json_decode($json_tasks,true);
echo count($task_array);

And echo count prints out '1' not '3'.

Oswald · Accepted Answer · 2013-10-26 11:29:42Z

17

Try echo count($task_array['task']);

In general, if you wonder what the structure of the value of a variable $var is, do a

<pre><?php var_export($var, true); ?></pre>

Advantage of this function over alternatives such as serialize and print_r is, that it prints PHP code (and is thus readable by anyone who understands PHP (which is likely if you program in PHP)). Disadvantage of var_export is, that it cannot handle circular structures (e.g. if $a->b == $a), but neither can JSON.

edited Oct 26, 2013 at 11:29

answered Oct 26, 2013 at 11:24

Oswald

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2 Comments

Buneme Kyakilika Over a year ago

Sorry my mistake, one more promblem when theres only 1 task, not 3, it says there are 6 tasks

Oswald Over a year ago

You are interpreting the data structure incorrectly. Did you try my hint about var_export?

Deepanshu Goyal · Accepted Answer · 2013-10-28 04:19:06Z

5

Well the 3 items are in 1 item "task" so, you have one array named task and the 3 elements are in it

try

echo count($task_array['task']);

EDIT :

please use the below code to print the array in correct pattern

echo '<pre>';
print_r($task_array['task']);
exit();

edited Oct 28, 2013 at 4:19

answered Oct 26, 2013 at 11:25

Deepanshu Goyal

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2 Comments

Buneme Kyakilika Over a year ago

Sorry my mistake, one more promblem when theres only 1 task, not 3, it says there are 6 tasks

Deepanshu Goyal Over a year ago

@Coder101 well just look at your array, there is one array task in which there are 3 arrays and then in each of there 3 arrays there are 6 elements

Anders · Accepted Answer · 2015-10-12 15:44:31Z

5

$task_array = json_decode($json_tasks);
count($task_array->task);

EX: 3

From Taiwan

edited Oct 12, 2015 at 15:44

Anders

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answered Oct 12, 2015 at 8:00

coltphp

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Comments

Karthick · Accepted Answer · 2016-12-18 02:25:55Z

1

try this code, here i can able to count the number of objects with specific value

here's my data.json file content

{"likes":[
    {"user_id":1,"time":"12:04pm"},
    {"user_id":2,"time":"02:04pm"},
    {"user_id":67,"time":"11:04pm"},
    {"user_id":1,"time":"12:04pm"}
]}

here's the php code

<?php
$jsonData = file_get_contents("data.json");
$data = json_decode($jsonData,true);
$total = 0;
foreach ($data["likes"] as $value) {
    if($value["user_id"]==1){
        $total = $total+1;
    }
}
echo $total;
?>

output will be

answered Dec 18, 2016 at 2:25

Karthick

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