PHP Sort Array by Field

PHP Sort array by field?

Use usort which is built explicitly for this purpose.

function cmp($a, $b)
{
    return strcmp($a["title"], $b["title"]);
}

usort($array, "cmp");

Sort array of objects by one property

Use usort, here's an example adapted from the manual:

function cmp($a, $b) {
    return strcmp($a->name, $b->name);
}

usort($your_data, "cmp");

You can also use any callable as the second argument. Here are some examples:

• Using anonymous functions (from PHP 5.3)

    usort($your_data, function($a, $b) {return strcmp($a->name, $b->name);});
  

• From inside a class

    usort($your_data, array($this, "cmp")); // "cmp" should be a method in the class
  

• Using arrow functions (from PHP 7.4)

    usort($your_data, fn($a, $b) => strcmp($a->name, $b->name));
  

Also, if you're comparing numeric values, fn($a, $b) => $a->count - $b->count as the "compare" function should do the trick, or, if you want yet another way of doing the same thing, starting from PHP 7 you can use the Spaceship operator, like this: fn($a, $b) => $a->count <=> $b->count.

sorting a column in a PHP array

You can use uasort

uasort($entity_list, 'mySort');

function mySort($a, $b) {
    return ($a['student_last_name'] <==> $b['student_last_name']);
}

But if your data come from a DB, it would be a lot easier and lighter to ORDER BY.

How do I sort a multidimensional array by one of the fields of the inner array in PHP?

You need to use usort, a function that sorts arrays via a user defined function. Something like:

function cmp($a, $b)
{
    if ($a["price"] == $b["price"]) {
        return 0;
    }
    return ($a["price"] < $b["price"]) ? -1 : 1;
}

usort($yourArray,"cmp")

PHP sort array of objects by two properties

Why the extra level of indirection and making things more confusing? Why not usort directly with usort($objectArray, "sortObjects"); using a sortObjects($a,$b) function that does what any comparator does: return negative/0/positive numbers based on the input?

If the tabs differ, return their comparison, if they're the same, return the order comparison; done.

$array = array(
    (object)array(
        'tab_option_name_selector' => 2,
        'fieldtype' => 'notes',
        'order' => 12
    ),
    (object)array(
        'tab_option_name_selector' => 2,
        'fieldtype' => 'notes',
        'order' => 8
    ),
    (object)array(
        'tab_option_name_selector' => 1,
        'order' => 2,
        'fieldtype' => 'selectbox'
    ),
    (object)array(
        'tab_option_name_selector' => 2,
        'order' => 3,
        'fieldtype' => 'selectbox'
    )
);

function compareTabAndOrder($a, $b) {
    // compare the tab option value
    $diff = $a->tab_option_name_selector - $b->tab_option_name_selector;
    // and return it. Unless it's zero, then compare order, instead.
    return ($diff !== 0) ? $diff : $a->order - $b->order;
}

usort($array, "compareTabAndOrder");
print_r($array);

Sorting php array by column in ascending order

You can try this -

$new = array();
// Extract and get the keys as values
$order = array_flip($array['order']);
// sort them according to keys
ksort($order);
// loop through main array
foreach($array as $key => $sub_array) {
  // loop through order
  foreach ($order as $o) {
    // store the new value according to order
    $new[$key][] = $sub_array[$o];
  }
}

Demo

Sort array of objects by property value inside a function

as always, sorting algorithm uses a compare function behind the scene to sort the whole array by comparing two element, for sorting complex stuff like this, one should write compare function and define the logic there for ordering

function compare($a, $b)
{
    return strtotime($a->metadata['endtime']) < strtotime($b->metadata['endtime']);
}

usort($yourarray, 'compare');

PHP sort array by two field values

array_multisort() is the correct function, you must have messed up somehow:

// Obtain a list of columns
foreach ($data as $key => $row) {
    $return_fare[$key]  = $row['return_fare'];
    $one_way_fare[$key] = $row['one_way_fare'];
}

// Sort the data with volume descending, edition ascending
array_multisort($data, $return_fare, SORT_ASC, $one_way_fare, SORT_ASC);

If you take a look at the comments at PHP's manual page for array_multisort(), you can find a very helpful array_orderby() function which allows you to shorten the above to just this:

$sorted = array_orderby($data, 'return_fare', SORT_ASC, 'one_way_fare', SORT_ASC);

To avoid the looping use array_column() (as of PHP 5.5.0):

array_multisort(array_column($data, 'return_fare'),  SORT_ASC,
                array_column($data, 'one_way_fare'), SORT_ASC,
                $data);

How to sort an array of objects by object field in PHP?

You'll need to write your own function to do the comparison. Once you have that function, you can then use usort - http://php.net/manual/en/function.usort.php

Note that this also works with sorting an array of objects, you just have to change your comparison function.

---

Related Topics