Moving an element with specific value to the end of dimensional array - php

Question

Original Array
$sonuc['rec'][0]['m_unseen'] = 1;
$sonuc['rec'][0]['user_id'] = 234;
$sonuc['rec'][0]['id'] = 133;
$sonuc['rec'][0]['last_updated'] = date();
$sonuc['rec'][0]['user']['unseen'] = 0;
$sonuc['rec'][0]['user']['id'] = 234;
$sonuc['rec'][1]['m_unseen'] = 0;
$sonuc['rec'][1]['user_id'] = 234;
$sonuc['rec'][1]['id'] = 134;
$sonuc['rec'][1]['last_updated'] = date();
$sonuc['rec'][1]['user']['unseen'] = 0;
$sonuc['rec'][1]['user']['id'] = 234;
$sonuc['rec'][2]['m_unseen'] = 0;
$sonuc['rec'][2]['user_id'] = 234;
$sonuc['rec'][2]['id'] = 135;
$sonuc['rec'][2]['last_updated'] = date();
$sonuc['rec'][2]['user']['unseen'] = 0;
$sonuc['rec'][2]['user']['id'] = 234;
$sonuc['rec'][3]['m_unseen'] = 1;
$sonuc['rec'][3]['user_id'] = 234;
$sonuc['rec'][3]['id'] = 136;
$sonuc['rec'][3]['last_updated'] = date();
$sonuc['rec'][3]['user']['unseen'] = 0;
$sonuc['rec'][3]['user']['id'] = 234;
Expected Result
$sonuc['rec'][0]['m_unseen'] = 1;
$sonuc['rec'][0]['user_id'] = 234;
$sonuc['rec'][0]['id'] = 133;
$sonuc['rec'][0]['last_updated'] = date();
$sonuc['rec'][0]['user']['unseen'] = 0;
$sonuc['rec'][0]['user']['id'] = 234;
$sonuc['rec'][1]['m_unseen'] = 1;
$sonuc['rec'][1]['user_id'] = 234;
$sonuc['rec'][1]['id'] = 136;
$sonuc['rec'][1]['last_updated'] = date();
$sonuc['rec'][1]['user']['unseen'] = 0;
$sonuc['rec'][1]['user']['id'] = 234;
$sonuc['rec'][2]['m_unseen'] = 0;
$sonuc['rec'][2]['user_id'] = 234;
$sonuc['rec'][2]['id'] = 134;
$sonuc['rec'][2]['last_updated'] = date();
$sonuc['rec'][2]['user']['unseen'] = 0;
$sonuc['rec'][2]['user']['id'] = 234;
$sonuc['rec'][3]['m_unseen'] = 0;
$sonuc['rec'][3]['user_id'] = 234;
$sonuc['rec'][3]['id'] = 135;
$sonuc['rec'][3]['last_updated'] = date();
$sonuc['rec'][3]['user']['unseen'] = 0;
$sonuc['rec'][3]['user']['id'] = 234;
I am trying to move all elements with m_unseen value is 0 to the end of the array.
I tried but couldn't get the expected result
function moveElement(&$array, $a, $b) {
$out = array_splice($array, $a, 1);
array_splice($array, $b, 0, $out);
}
$keys = array_keys(array_column($sonuc['rec'], 'm_unseen'), 0);
foreach ($keys as $key) {
moveElement($sonuc['rec'], $key, $say);
}
Any idea?

Answer 1

You could use the usort function with a custom callback to do the trick
This function takes two argument, the array ( passed by reference ) and a callback with two element. You compare the two element in the callback.
Here, we've simply subtract one "m_unseen" to the other since they are numbers. If it was another type, we would need to return a positive or negative integer, or 0 if they are equals, since that's what the usort function expect.
<?php
$sonuc = array();
$sonuc['rec'][0]['m_unseen'] = 1;
$sonuc['rec'][0]['user_id'] = 234;
$sonuc['rec'][0]['id'] = 133;
$sonuc['rec'][0]['last_updated'] = date(1584796457);
$sonuc['rec'][0]['user']['unseen'] = 0;
$sonuc['rec'][0]['user']['id'] = 234;
$sonuc['rec'][1]['m_unseen'] = 0;
$sonuc['rec'][1]['user_id'] = 234;
$sonuc['rec'][1]['id'] = 134;
$sonuc['rec'][1]['last_updated'] = date(1584796457);
$sonuc['rec'][1]['user']['unseen'] = 0;
$sonuc['rec'][1]['user']['id'] = 234;
$sonuc['rec'][2]['m_unseen'] = 0;
$sonuc['rec'][2]['user_id'] = 234;
$sonuc['rec'][2]['id'] = 135;
$sonuc['rec'][2]['last_updated'] = date(1584796457);
$sonuc['rec'][2]['user']['unseen'] = 0;
$sonuc['rec'][2]['user']['id'] = 234;
$sonuc['rec'][3]['m_unseen'] = 1;
$sonuc['rec'][3]['user_id'] = 234;
$sonuc['rec'][3]['id'] = 136;
$sonuc['rec'][3]['last_updated'] = date(1584796457);
$sonuc['rec'][3]['user']['unseen'] = 0;
$sonuc['rec'][3]['user']['id'] = 234;
usort($sonuc['rec'], function($a, $b) {
// switching the variable here would order the array ASC rather than DSC.
return $b['m_unseen'] - $a['m_unseen'];
});
var_dump($sonuc);
Here is a sandbox for you to test it out

Answer 2

usort with custom sort function is enough:
usort($sonuc['rec'], function($a, $b) {
return 1 == $a['m_unseen'] ? -1 : 1;
});

Answer 3

You can simply move the m_unseen with non zero values to the front, swapping zero values to the back with the help of a pointer variable.
<?php
$ptr = 0;
foreach($sonuc['rec'] as $key => $value){
if($value['m_unseen'] != 0){
$temp = $sonuc['rec'][$ptr];
$sonuc['rec'][$ptr++] = $value;
$sonuc['rec'][$key] = $temp;
}
}
Demo: https://3v4l.org/o1c5R