如何在PHP中按一个可能在三个级别的键对多维哈希数组进行排序？

Question

I am moving from Perl to PHP and am struggling to get my head around PHP sorting.

Here's what I have in Perl:

$log{'11111'}{'1'}{'20100102'}{'name'}='blah';
$log{'11111'}{'1'}{'20100101'}{'name'}='blah';
$log{'11111'}{'1'}{'20100103'}{'name'}='blah';

$cook='11111';

foreach $entry (sort {$log{$cook}{$a}{time} cmp $log{$cook}{$b}{time}} keys %{$log{$cook}}){
       ...
       }

Basically, I would have the same array structure in PHP but want to sort like I do above.

Answer 1

You need the usort function.

You'll provide it with a compare callback function which would do the job of

{$log{$cook}{$a}{time} cmp $log{$cook}{$b}{time}}