error using uasort with multidimensional array: undefined index

Question

i have this array

$array["4E-952778"][0]['fileName'] = "File 1";
$array["4E-952778"][0]['product'] = "Muse On Demand";
$array["4E-952778"][1]['fileName'] = "File 2";
$array["4E-952778"][1]['product'] = "Muse On Demand";   

$array["15210"][0]['fileName'] = "File 3";
$array["15210"][0]['product'] = "4Manager"; 
$array["15210"][1]['fileName'] = "File 4";
$array["15210"][1]['product'] = "4Manager";

and im trying to sort it using uasort() this way:

uasort($array, function ($a, $b) { return strcmp($a['product'], $b['product']); });

but im getting an error: undefined index product

When you sort the array, you are only sorting based on the outermost dimension. Therefore the $a and $b don't have index product, they have indexes 0 and 1. And inside those would be product — Sami Kuhmonen
– Sami Kuhmonen, Commented Apr 7, 2015 at 9:40

Death-is-the-real-truth · Accepted Answer · 2015-04-07 09:39:08Z

1

Try this:-

uasort($array, function ($a, $b) {
     $i=0;
     return strcmp($a[$i]['product'], $b[$i]['product']);
});

edited Apr 7, 2015 at 9:39

answered Apr 7, 2015 at 9:28

Death-is-the-real-truth

72.3k10 gold badges59 silver badges105 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Death-is-the-real-truth Over a year ago

Sorry, rather than edit, delete is happen. but i reposted it. Please have a look.

Collectives™ on Stack Overflow

error using uasort with multidimensional array: undefined index

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related