Searching specific value in array - php

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?

Answer 1

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

Answer 2

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

Answer 3

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);

Answer 4

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');