php sorting a seriously multidimensional array...
- by BigDogsBarking
I'm trying to sort a multidimensional object, and, after looking on php.net and around here, I get that I should write a function that I can then call via usort. I'm having some trouble with the syntax. I haven't ever written something this complicated before, and trying to figure it out feels like a mindbender...
I'm working with the array posted at the end of this post. I want to filter out duplicate [n] values. But, and this is the tricky part for me, I want to keep the [n] value that has the smallest [d] value.
So, if I have (and this example is simplified, the real array is at the end of this post):
Array (
[7777] => Array
( [0] => Array
( [n] => '12345' [d] => 1 )
[1] => Array
( [n] => '67890' [d] => 4 )
)
[8888] => Array
( [2] => Array
( [n] => '12345' [d] => 10 )
[3] => Array
( [n] => '67890' [d] => 2 )
)
)
I want to filter out duplicate [n] values based on the [d] value, so that I wind up with this:
Array (
[7777] => Array
( [0] => Array
( [n] => '12345' [d] => 1 )
)
[8888] => Array
[3] => Array
( [n] => '67890' [d] => 2 )
)
)
I've tried writing different variations of the function cmp example posted on php.net, but I haven't been able to get any to work, and I think it's because I'm not altogether clear on how to traverse it using their example...
I tried:
function cmp($a, $b)
{
if($a['n'] == $b['n'])
{
if($a['d'] == $b['d'])
{
return 0;
}
}
return ($a['n'] < $b['n']) ? -1 : 1;
}
But, that really did not work at all... Anyway, here's the real array I'm trying to work with... Help is greatly appreciated!
Array
(
[32112] => Array
(
[0] => Array
(
[n] => '02124'
[d] => '0'
)
[1] => Array
(
[n] => '02124'
[d] => '0.240101905123744'
)
[2] => Array
(
[n] => '11050'
[d] => '0.441758632682761'
)
[3] => Array
(
[n] => '02186'
[d] => '0.317514080260304'
)
)
[43434] => Array
(
[4] => Array
(
[n] => '02124'
[d] => '5.89936971664429e-05'
)
[5] => Array
(
[n] => '02124'
[d] => '0.145859264792549'
)
[6] => Array
(
[n] => '11050'
[d] => '0.327864593457739'
)
[7] => Array
(
[n] => '11050'
[d] => '0.312135345168295'
)
)
)
