php how to get key data out of associative array code example

Example 1: php get array key

<?php
$array = array(
    'fruit1' => 'apple',
    'fruit2' => 'orange',
    'fruit3' => 'grape',
    'fruit4' => 'apple',
    'fruit5' => 'apple');

// this cycle echoes all associative array
// key where value equals "apple"
while ($fruit_name = current($array)) {
    if ($fruit_name == 'apple') {
        echo key($array).'<br />';
    }
    next($array);
}
?>

Example 2: php take out 2 level array key value

foreach($bigArray as $array){    
    foreach($array as $key=>$value){
        echo $key;
    }
}


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