Searching specific value in array

Question

I have an array, and i want to find all values where correct => true:

   $quiz_array = array (
            'question1' => array (
                        'q1a1' => array (
                                  'correct' => FALSE,
                                  'answer' => 'false answer1'
                        ),
                        'q1a2' => array (
                                  'correct' => FALSE,
                                  'answer' => 'false answer2'
                        ),
                        'q1a3' => array (
                                  'correct' => FALSE,
                                  'answer' => 'false answer3'
                        ),                  
                        'q1a4' => array (
                                  'correct' => TRUE,
                                  'answer' => 'correct answer'
                        )
            )
    );

I want to do a search, where it would return q1a4 in this case, because correct => TRUE. I trid using in_array and array_search but no luck. Any suggestions?

possible duplicate of [Find values in multidimensional arrays](http://stackoverflow.com/questions/10811908/find-values-in-multidimensional-arrays) — JJJ, May 03 '13 at 10:13

score 0 · Answer 1 · answered May 03 '13 at 10:14

0

foreach ($quiz_array as $key => $value) {
 if (strpos($value, '<name of value you want to search>') !== false) {
    $new_key = $key;
    break;
  }
}

answered May 03 '13 at 10:14

Vaibhav Jain

3,729
3
25
42

billyonecan · Answer 2 · 2013-05-03T10:35:17.173

You could do something like this:

$correctAnswers = array();
foreach ($quiz_array as $question => $answers) {
  $correctAnswers[$question] = array_filter($answers, function($v) { 
    return $v['correct']; 
  });
}
var_dump($correctAnswers); // array('question1' => array('q1a4' => array('correct' => true, 'answer' => 'correct answer')));

If you want to return just the correct answers key (eg. q1a41) you could do:

$correctAnswers = array();
foreach ($quiz_array as $question => $answers) {
  foreach ($answers as $k => $a) {
    if ($a['correct']) { 
      $correctAnswers[$question] = $k;
    }
  }
}
var_dump($correctAnswers); // array('question1' => 'q1a4');

score 0 · Answer 3 · answered May 03 '13 at 10:30

0

function correct($array) {
    return $array('correct');
}

$results= array();
foreach($quiz_array as $key => $value) {
    $correct= array_filter($value, 'correct');
    $results[$key]= $correct;
}

print_r($results);

answered May 03 '13 at 10:30

Adder

5,708
1
28
56

score 0 · Accepted Answer · answered May 03 '13 at 10:34

0

Here is your answer,

foreach($quiz_array as $key=> $value) {
  foreach($quiz_array[$key] as $key=> $value) {
    if( $value["correct"] ) {
        echo $key ."<br>";  
    }
  }
}

answered May 03 '13 at 10:34

6339

475
3
16

Searching specific value in array

4 Answers4