CODEWITHSUNDEEP
phpjson
fischer
fischer

Reputation: 101

JSON to PHP array getting "Trying to get property of non-object in" Error

Hello I have Json like this:

[{
    "exam_code": "1",
    "name": "Name1",
    "surname": "Surname1",
    "father_name": "Fname1",
    "id_number": "211111",
    "district_number": "21",
    "school_number": "025",
    "gender": "F",
    "variant": "A",
    "grade": "4",
    "sector": "A",
    "foreign_language": "I",
    "answerList": {
        "gradeFour": {
            "lesson1": ["A", "C", "C", "C", "A", "A", "B", "B", " ", "C", "C", "B", "A", "C", "C", "B", "B", "C", "B", "A"],
            "lesson2": ["B", "A", " ", "C", " ", "B", " ", "B", "B", "C", " ", " ", "B", "A", "A", "A", "C", "A", "B", "B"],
            "lesson3": ["A", "C", "B", "B", "A", "A", "C", "A", "C", "C"],
            "lesson4": ["B", "B", "A", "B", "B"],
            "lesson5": ["B", "A", "A", "B", "B"],
            "lesson6": ["B", "A", "A", "B", "A", "B", "A", "A", "C", "B"]
        }
    }
}]

I am trying to print out lessons answers on foreach loop.

tried below code:

<?php
$msc = microtime(true);


$array = (json_decode($raw_str,true));

foreach($array as $value){
echo $value['id_number'];
    echo '<br/>';

   foreach($value -> answerList->gradeFour as $val){
        echo $val;    
  }

  echo '<br>---------------------------';
  echo '<br>';

}
$msc = microtime(true)-$msc;
echo ($msc * 1000) . ' ms'; // in millseconds
?>

But getting this error

Notice: Trying to get property of non-object in G:\xampp\htdocs\siec\string_test.php on line 50 Notice: Trying to get property of non-object in G:\xampp\htdocs\siec\string_test.php on line 50 Warning: Invalid argument supplied for foreach() in G:\xampp\htdocs\siec\string_test.php on line 50

Upvotes: 2

Views: 2198

Answers (3)

Fathi
Fathi

Reputation: 158

Your problem in line 5 you must decode it as associative arrays read json_decode

check the code below, it will help you to more understand 

 $array = json_decode($raw_str);

 foreach($array as $value){
    echo $value->id_number;
    echo '<br/>';

    foreach($value->answerList->gradeFour as $key => $val){
       echo $key;
       echo "<pre>";
       print_r($val);
       echo "</pre>";

    }

    echo '<br>---------------------------';
    echo '<br>';

}

Upvotes: 0

Moradnejad
Moradnejad

Reputation: 3653

There are two problems to your code:

  • First, you have to use brackets instead of ->

  • Second, you need to use nested loop (two fors) to print the grades, since you have multiple grades (an array) for multiple lessons (another array).

So your complete code will be like this:

$msc = microtime(true);

$array = (json_decode($raw_str,true));

foreach($array as $value){
echo $value['id_number'];
    echo '<br/>';

   foreach($value['answerList']['gradeFour'] as $course){
        foreach($course as $val){
            echo $val;    
        }   
    }

  echo '<br>---------------------------';
  echo '<br>';

}

Upvotes: 0

Amir
Amir

Reputation: 423

In your second foreach loop, $value is an array. So you have to use it with brackets [] not -> :

foreach($value['answerList']['gradeFour'] as $val) {

Upvotes: 1

Related Questions