Sorting multiple array in php [closed]

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Can someone help me i need to sort this array:

$report_fields['client_id'] = $row['client_id'];
$report_fields['name'] = $row['name'];
$report_fields['is_authorized'] = $row['is_authorized'];
$report_fields['date_created'] = $row['date_created'];
$report_fields['service_id'] = $row['service_id'];
$report_fields['type_id'] = $row['type_id'];
$report_fields['report_name'] = $report_types[$row['type_id']]['type'];


$report_groups[$row['ref_no']][$row['id']] = $report_fields;

I have tried usort like so:

usort($report_groups[$row['ref_no']],'cmp');

function cmp($a,$b) { 
   $a_stm = strtotime($a["date_created"]);
   $b_stm = strtotime($b["date_created"]);

   if ($a_stm == $b_stm) {
    return 0;
    }

   return ($a_stm < $b_stm) ? -1 : 1;

}

But the result returned is incorrect.

We might recommend array_multisort() but if your ref_no values are numeric, you'll lose them. This question is missing its minimal reproducible example. Implementing usort() is going to be a little more clumsy because you have dynamic id values as the second level keys -- so you'd need two function calls on each iteration. — mickmackusa
– mickmackusa ♦, Commented Feb 2 at 10:27

Angelo Vargas · Accepted Answer · 2011-05-15 21:21:47Z

1

array_multisort is what you want to use.

Here's an example

<?php

$sort = array(
    array(),
    array()
);

foreach ($results as $k=>$result) {
    $sort[0][$k] = $result['sort_field_one'];
    $sort[1][$k] = $result['sort_field_two'];   
}


# sort using $sort[0] DESC and $sort[1] ASC
array_multisort($sort[0], SORT_DESC, $sort[1], SORT_DESC, $results);

answered May 15, 2011 at 21:21

Angelo Vargas

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