如果值不为空，则在foreach循环中对数组进行排序

I have this foreach loop and i was wondering if there could be a way to sort the array accurding to a value if it's not empty to be at top and the rest goes down. here what I have done so far:

foreach ((array)$accounts as $v=>$k){
        if(!empty($k)) {
                echo $v;
                echo "</br>";
                echo $k;
                echo "</br>";
        } else {
            echo $v;
            echo "</br>";
        }
    }

Note: $k returns either a string or it's just empty not NULL

The ouput is something like:

k1
v1
k2
k3
v3

As you can see k2 has no value. i want it to be at the bottom as it doesn't have a value.

Outputing the array directly with print_r($accounts, TRUE):

Array
(
    [TwitterSecKey] => Twitter Sec Key
    [GoogleSecKey] => 
    [InstagramSecKey] => Instagram Sec Key
    [FacebookSecKey] => 
)

As you can see Google and Facebook don't have values. so i want them to be at the bottom.

Thank you for finally providing your array structure.

Based on your requirement of:

sort the array accurding to a value if it's not empty to be at top and the rest goes down

There is no need for complicated sorting algorithms with uasort(), please try this:

<?php

$accounts= array(
    'TwitterSecKey'=>'Twitter Sec Key',
    'GoogleSecKey'=>null,
    'InstagramSecKey'=>'Instagram Sec Key',
    'FacebookSecKey'=>null
);

echo '<pre>'.print_r($accounts, TRUE).'</pre>';

arsort($accounts); // secret sauce

echo '<pre>'.print_r($accounts, TRUE).'</pre>';

http://php.net/manual/en/array.sorting.php

You can do this to sort your array using usort and then use them accordingly

$accounts = (array) $accounts;
usort($accounts, function($a, $b) {
    return strlen($b) - strlen($a);
});

Now.

 foreach($accounts as $k=>$v){
       echo 'key: '. $k .'<br>';
       echo 'value: '. $v .'<br>';
     }

UPDATE To preserve keys you can use uasort as

$accounts = (array) $accounts;
    uasort($accounts, function($a, $b) {
        return strlen($b) - strlen($a);
    });

You could use a custom function with uasort, which puts empty values last, but sorts all the rest alphabetically:

$accounts = array (
  'x' => 'c',
  'y' => 'a',
  'z' => 'b',
  'n' => '',
);

uasort($accounts, function($a, $b) {
    return empty($a) ? 1 : (empty($b) ? -1 : strcmp($a,$b));
});

var_export($accounts);

Output:

array (
  'y' => 'a',
  'z' => 'b',
  'x' => 'c',
  'n' => '',
)