Modifying usort function to include keys [duplicate] - php

Question

This question already has answers here:
Sort multidimensional array by multiple columns
(8 answers)
Closed 10 months ago.
I went through all the similiar questions but couldn't find an answer....so here goes.
My current array, simplified:
[order] => Array
(
[0] => Array
(
[strSupplier] => XYZ
(varying other fields)
)
[1] => Array
(
[strSupplier] => XYZ
(varying other fields)
)
[2] => Array
(
[strSupplier] => YYZ
(varying other fields)
)
)
Code:
function custom_sort2($a,$b) {
return $a['strSupplier']>$b['strSupplier'];
}
// Sort the multidimensional array
usort($tempOrderArray, "custom_sort2");
Currently, I am sorting on only the supplier, however, I need to ensure that the key is the second sort criteria, and I am not sure that it is.
Is there a way I can guarantee that it is sorted by strSupplier first, then key? If this is built into either the uasort or usort function, I apologize - I did not see it.

Answer 1

Your array would like this this:
[order] => Array
(
[0] => Array
(
[key] => 0,
[strSupplier] => 'XYZ',
//(varying other fields)
)
[1] => Array
(
[key] = 1,
[strSupplier] => 'XYZ',
//(varying other fields)
)
[2] => Array
(
[key] = 2,
[strSupplier] => 'YYZ',
//(varying other fields)
)
)
Then, when you sort:
function custom_sort2($a, $b) {
$cmp = $cmpstr = strcmp($a['strSupplier'], $b['strSupplier']); //Compare the string
$cmpkey = ($a['key'] == $b['key'] ? 0 : ($a['key'] > $b['key'] ? 1 : -1)); //Compare the key
if ($cmpkey == 1)
$cmp = ($cmpstr >= 0) ? 1 : 0;
return $cmp; //If we are moving the element forward, then we need to check the key.
}
// Sort the multidimensional array
uasort($array, "custom_sort2");

Answer 2

You could try using ksort first, and then sort by supplier.