### Result of sort
sort($keys_arranged, SORT_NUMERIC);
var_dump($keys_arranged);
{ ...
[51]=> float(11.903327742296)
[52]=> int(5)
[53]=> float(13.165002546636)
[54]=> float(14.478273306964)
[55]=> float(4.6264742674547)
[56]=> float(13.290508819344)
[57]=> float(15.686809055276) }
### Result or rsort
rsort($keys_arranged, SORT_NUMERIC);
var_dump($keys_arranged);
{
[0]=> float(15.686809055276)
[1]=> float(14.478273306964)
[2]=> float(13.290508819344)
[3]=> float(13.165002546636)
[4]=> float(11.903327742296)
[5]=> int(5)
[6]=> float(4.6264742674547)
... }
echo var_export($keys_arranged);
array ( 0 => 3.142678516658294, 1 => 1.0, 2 => 1.0, 3 => 14.478273306963985, 4 => 13.165002546635966, 5 => 1.0, 6 => 1.0005037081114851, 7 => 1.0, 8 => 4.6264742674547001, 9 => 15.686809055275578, 10 => 1.0, 11 => 11.903327742295504, 12 => 13.29050881934397, 13 => 1.0, 14 => 1.0, 15 => 3.5421134937189365, 16 => 1.0, 17 => 0.010999999999999999, 18 => 3.2999566681750605, 19 => 5, 20 => 1.2282984802843129, 21 => 1.0, 22 => 2.9748253120971184, 23 => 0.44855992975075798, 24 => 0.99999999999999989, 25 => 3.8350475954623371, 26 => 1.0625975061426283, 27 => 1.0000072792091179, 28 => 0.99999987785487132, 29 => 1, 30 => 0.0, 31 => 1.0, 32 => 1.0, 33 => 1.0, 34 => 0.0, 35 => 1.0972568578553616, 36 => 1.0, 37 => 1.4077661823957415, 38 => 1.0, 39 => 0.0, 40 => 3.6038030347555705, 41 => 1.0, 42 => 1.0, 43 => 1.0636876768842174, 44 => 1.0, 45 => NAN, 46 => 1.0, 47 => NAN, 48 => NAN, 49 => NAN, 50 => NAN, 51 => 1.0, 52 => 1.0, 53 => NAN, 54 => 0.99958680716631509, 55 => 1.0, 56 => NAN, 57 => 1.0, )
I got some incorrect result from array_multisort. It has 8 different keys and all the keys but this key(say A) works fine.
To figure out why that happened, I played with A in the array. And I could see that not only in the function of array_multisort, but also in 'sort' function, an incorrect result prompted as well.
As you can see the result of rsort seems okay, the result of sort works strangely when it comes to 13.16 < 14.47 < 4.62 < 13.29 < 15.68
Does anyone know why this occurred?
// Data in readible format
array (
0 => 3.142678516658294,
1 => 1.0,
2 => 1.0,
3 => 14.478273306963985,
4 => 13.165002546635966,
5 => 1.0,
6 => 1.0005037081114851,
7 => 1.0,
8 => 4.6264742674547001,
9 => 15.686809055275578,
10 => 1.0,
11 => 11.903327742295504,
12 => 13.29050881934397,
13 => 1.0,
14 => 1.0,
15 => 3.5421134937189365,
16 => 1.0,
17 => 0.010999999999999999,
18 => 3.2999566681750605,
19 => 5,
20 => 1.2282984802843129,
21 => 1.0,
22 => 2.9748253120971184,
23 => 0.44855992975075798,
24 => 0.99999999999999989,
25 => 3.8350475954623371,
26 => 1.0625975061426283,
27 => 1.0000072792091179,
28 => 0.99999987785487132,
29 => 1,
30 => 0.0,
31 => 1.0,
32 => 1.0,
33 => 1.0,
34 => 0.0,
35 => 1.0972568578553616,
36 => 1.0,
37 => 1.4077661823957415,
38 => 1.0,
39 => 0.0,
40 => 3.6038030347555705,
41 => 1.0,
42 => 1.0,
43 => 1.0636876768842174,
44 => 1.0,
45 => NAN,
46 => 1.0,
47 => NAN,
48 => NAN,
49 => NAN,
50 => NAN,
51 => 1.0,
52 => 1.0,
53 => NAN,
54 => 0.99958680716631509,
55 => 1.0,
56 => NAN,
57 => 1.0, )