排序多个维度数组php

Question

I need to sort an array like

$arrayName = array(0 => array('val' => 100), 1 => array('val' => 75),3 => array('val' => 10), 4 => array('val' => 15));

I need output like this

$arrayName = array(3 => array('val' => 10), 4 => array('val' => 15),1 => array('val' => 75), 0 => array('val' => 100));

Answer 1

This should work for you:

(Use asort() so you don't lose your key's)

<?php

    $arrayName = array(0 => array('val' => 100), 1 => array('val' => 75),3 => array('val' => 10), 4 => array('val' => 15));
    asort($arrayName);

    print_r($arrayName);

?>

Output:

Array ( [3] => Array ( [val] => 10 ) [4] => Array ( [val] => 15 ) [1] => Array ( [val] => 75 ) [0] => Array ( [val] => 100 ) )

Answer 2

try this

foreach ($arrayName as $key => $row) {
$data[$key]  = $row[0]; 
// of course, replace 0 with whatever is the date field's index
}
array_multisort($data, SORT_ASC, $arrayName);

Answer 3

Use krsort for sort array by key in descending order

krsort($arrayName);
print_r($arrayName);

Answer 4

Rizier123 has the simplest solution. If you needed to have more complex comparisons (say your array had multiple keys/values that you want to sort on), you could use uasort and create a custom comparison function ( uasort preserves array keys while usort does not). For example:

public function cmp($a, $b)
{
    if ($a['val'] == $b['val']) {
        return 0;
    }

    return ($a['val'] < $b['val']) ? -1 : 1;
}

uasort($arrayName, 'cmp');