Sort two level multidimensional array by value

Question

Any way to sort the below array by the value it contains in the order field?

$line = array(
  0 => array(
    0 => array('order' => 3)
  ),
  1 => array(
    0 => array('order' => 1)
  ),
  2 => array(
    0 => array('order' => 2)
  ),
);

Required output -

$line = array(
    0 => array(
      0 => array('order' => 1)
    ),
    1 => array(
      0 => array('order' => 2)
    ),
    2 => array(
      0 => array('order' => 3)
    ),
  );

tried the below code but it does not work -

uasort($line, function($a, $b) {
    return $a['entity_id'] - $b['entity_id'];
  });

Update - The keys in all the above arrays are not-known, just written here for an eg.

jitendrapurohit · Accepted Answer · 2018-02-13 11:20:11Z

2

Use the below code -

usort($line, function($a, $b) {
    return current($a)['order'] - current($b)['order'];
});

answered Feb 13, 2018 at 11:20

jitendrapurohit

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1 Comment

phpblogger Over a year ago

Thanks, It worked, I am not able to upvote, can only accept the answer.

Oleg Butuzov · Accepted Answer · 2018-02-13 11:11:31Z

1

uasort($line, function($a, $b) {
    return array_shift($a)['order'] <=> array_shift($b)[0]['order'];
});

edited Feb 13, 2018 at 11:11

answered Feb 13, 2018 at 11:06

Oleg Butuzov

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6 Comments

phpblogger Over a year ago

the keys keep on changing and not necessarily 0.

Oleg Butuzov Over a year ago

is it only one value (one subarray) in this parent array?

phpblogger Over a year ago

yes, the format is same, just the keys are different

Oleg Butuzov Over a year ago

Here you go. Just grab array value of subarray. Thanks php isn't c++, python or go, so changing array values inside callback scope wouldn't affect original array.

Oleg Butuzov Over a year ago

Its supported in PHP7. last PHP5 (5.6) is already passed End of Lifecycle, and not recommended to be used. You can repalce <=> with > with almost same effect.

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