output error in php json-decode - php

Question

my php code generate a non-Valid json output error
my php code :
$questions = array();
while($question = mysql_fetch_array($result, MYSQL_ASSOC)) {
$questions[] = array('question'=> $question);
}
print_r ($questions);
$newQuestions = array('questions' => array());
foreach($questions as $key => $question){
$newQuestion = array(
'question' => $question['question']['question'],
'correct' => $question['question']['correct'],
'answers' => array(
$question['question']['answer1'],
$question['question']['answer2'],
$question['question']['answer3'],
$question['question']['answer4']
)
);
$newQuestions['questions'][] = $newQuestion;
}
$output = json_encode(($newQuestions),JSON_UNESCAPED_UNICODE);
echo '<br/><br/>';
echo $output;
table fields :
Question :
correct :
answer 1 :
answer 2 :
answer 3 :
answer 4 :
Example :
Question : is php a good language ?
correct : 1
answer 1 : yes
answer 2 : no
answer 3 : maybe
answer 4 : good
the output is OK, and formated as I want.
output sample : http://pastebin.com/eefS7KYW
I am sure my php code is correct but I don't know where is exactly the issue !!
==============
Fixed : it was just two echo $output !

Answer 1

Seems like you are doing a lot of variable passing which gets very confusing, very quickly. Especially when all the variables are iterations of 'question'. It appears that you are creating an array from information pulled from a database in the format [questions[question,correct,answers[1,2,3,4]]] This code format may work better?
$newQuestions = array();
while($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
$newQuestions['questions'][] = array(
'question' => $row['question'],
'correct' => $row['correct'],
'answers' => array(
$row['answer1'],
$row['answer2'],
$row['answer3'],
$row['answer4']
)
);
}
$output = json_encode(($newQuestions),JSON_UNESCAPED_UNICODE);
echo '<br/><br/>';
echo $output;
Had a semicolon in the wrong place.Fixed the code above and test the code with the following:
<?php
$array = array(
array('question'=>'Question1',
'correct'=>3,
'answer1' => 'Q1Answer1',
'answer2' => 'Q1Answer2',
'answer3' => 'Q1Answer3',
'answer4' => 'Q1Answer4'
),
array('question'=>'Question2',
'correct'=>3,
'answer1' => 'Q2Answer1',
'answer2' => 'Q2Answer2',
'answer3' => 'Q2Answer3',
'answer4' => 'Q1Answer4'
),
array('question'=>'Question3',
'correct'=>3,
'answer1' => 'Q3Answer1',
'answer2' => 'Q3Answer2',
'answer3' => 'Q3Answer3',
'answer4' => 'Q1Answer4'
)
);
$newQuestions = array();
//while($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
foreach($array as $row){
$newQuestions['questions'][] = array(
'question' => $row['question'],
'correct' => $row['correct'],
'answers' => array(
$row['answer1'],
$row['answer2'],
$row['answer3'],
$row['answer4']
)
);
}
print_r($newQuestions);
$output = json_encode(($newQuestions),JSON_UNESCAPED_UNICODE);
echo '<br/><br/>';
echo $output;
?>