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Php 从多维数组对浮点进行排序_Php_Arrays - Fatal编程技术网
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Php 从多维数组对浮点进行排序

php arrays

Php 从多维数组对浮点进行排序,php,arrays,Php,Arrays,我有这个阵列： Array ( [0] => Array ( [company_id] => 1 [avg_company] => [avg_product] => [avg_service] => [avg_price] => [avg_rating] => 0 ) [1] => Array ( [company_id] => 3 [avg_company

我有这个阵列：

Array
(
  [0] => Array
  (
    [company_id] => 1
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [1] => Array
  (
    [company_id] => 3
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [2] => Array
  (
    [company_id] => 4
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [3] => Array
  (
    [company_id] => 5
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [4] => Array
  (
    [company_id] => 6
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [5] => Array
  (
    [company_id] => 7
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [6] => Array
  (
    [company_id] => 11
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [7] => Array
  (
    [company_id] => 12
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [8] => Array
  (
    [company_id] => 13
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [9] => Array
  (
    [company_id] => 14
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [10] => Array
  (
    [company_id] => 15
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [11] => Array
  (
    [company_id] => 16
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [12] => Array
  (
    [company_id] => 17
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [13] => Array
  (
    [company_id] => 18
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [14] => Array
  (
    [company_id] => 19
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [15] => Array
  (
    [company_id] => 20
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [16] => Array
  (
    [company_id] => 21
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [17] => Array
  (
    [company_id] => 22
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [18] => Array
  (
    [company_id] => 23
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [19] => Array
  (
    [company_id] => 25
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [20] => Array
  (
    [company_id] => 26
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [21] => Array
  (
  [company_id] => 27
  [avg_company] =>
  [avg_product] =>
  [avg_service] =>
  [avg_price] =>
  [avg_rating] => 0
  )

  [22] => Array
  (
    [company_id] => 28
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [23] => Array
  (
    [company_id] => 29
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [24] => Array
  (
    [company_id] => 30
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [25] => Array
  (
    [company_id] => 31
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [26] => Array
  (
    [company_id] => 32
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [27] => Array
  (
    [company_id] => 33
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [28] => Array
  (
    [company_id] => 34
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [29] => Array
  (
    [company_id] => 35
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [30] => Array
  (
    [company_id] => 36
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [31] => Array
  (
    [company_id] => 37
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [32] => Array
  (
    [company_id] => 38
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [33] => Array
  (
    [company_id] => 39
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [34] => Array
  (
    [company_id] => 40
    [avg_company] => 4.00000
    [avg_product] => 2.00000
    [avg_service] => 5.00000
    [avg_price] => 5.00000
    [avg_rating_remark] => Solid
    [avg_rating] => 4.0
  )

  [35] => Array
  (
    [company_id] => 41
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [36] => Array
  (
    [company_id] => 42
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [37] => Array
  (
    [company_id] => 43
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [38] => Array
  (
    [company_id] => 44
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [39] => Array
  (
    [company_id] => 45
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [40] => Array
  (
    [company_id] => 46
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [41] => Array
  (
    [company_id] => 47
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [42] => Array
  (
    [company_id] => 48
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [43] => Array
  (
    [company_id] => 49
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [44] => Array
  (
    [company_id] => 50
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [45] => Array
  (
    [company_id] => 51
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [46] => Array
  (
    [company_id] => 52
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [47] => Array
  (
    [company_id] => 53
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [48] => Array
  (
    [company_id] => 55
    [avg_company] => 4.50000
    [avg_product] => 4.50000
    [avg_service] => 4.50000
    [avg_price] => 3.00000
    [avg_rating_remark] => Solid
    [avg_rating] => 4.1
  )

  [49] => Array
  (
    [company_id] => 58
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [50] => Array
  (
    [company_id] => 61
    [avg_company] => 5.00000
    [avg_product] => 5.00000
    [avg_service] => 5.00000
    [avg_price] => 5.00000
    [avg_rating_remark] => Excellent
    [avg_rating] => 5.0
  )

  [51] => Array
  (
    [company_id] => 62
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )
)
我想按主键值的降序排序avg_rating，因此我根据其他so问题使用此选项：

usort($ret, function($a, $b) {
  return $a['avg_rating'] - $b['avg_rating'];
});
然而，结果并不正确：

Array
(
  [0] => Array
  (
    [company_id] => 39
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [1] => Array
  (
    [company_id] => 38
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [2] => Array
  (
    [company_id] => 41
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [3] => Array
  (
    [company_id] => 42
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [4] => Array
  (
    [company_id] => 43
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [5] => Array
  (
    [company_id] => 37
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [6] => Array
  (
    [company_id] => 36
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [7] => Array
  (
    [company_id] => 32
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [8] => Array
  (
    [company_id] => 33
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [9] => Array
  (
    [company_id] => 34
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [10] => Array
  (
    [company_id] => 35
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [11] => Array
  (
    [company_id] => 44
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [12] => Array
  (
    [company_id] => 45
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [13] => Array
  (
    [company_id] => 52
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [14] => Array
  (
    [company_id] => 53
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [15] => Array
  (
    [company_id] => 58
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [16] => Array
  (
    [company_id] => 62
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [17] => Array
  (
    [company_id] => 51
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [18] => Array
  (
    [company_id] => 50
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [19] => Array
  (
    [company_id] => 46
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [20] => Array
  (
    [company_id] => 47
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [21] => Array
  (
    [company_id] => 48
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [22] => Array
  (
    [company_id] => 49
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [23] => Array
  (
    [company_id] => 1
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [24] => Array
  (
    [company_id] => 31
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [25] => Array
  (
    [company_id] => 13
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [26] => Array
  (
    [company_id] => 12
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [27] => Array
  (
    [company_id] => 14
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [28] => Array
  (
    [company_id] => 15
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [29] => Array
  (
    [company_id] => 16
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [30] => Array
  (
    [company_id] => 11
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [31] => Array
  (
    [company_id] => 7
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [32] => Array
  (
    [company_id] => 3
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [33] => Array
  (
    [company_id] => 4
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [34] => Array
  (
    [company_id] => 5
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [35] => Array
  (
    [company_id] => 6
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [36] => Array
  (
    [company_id] => 30
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [37] => Array
  (
    [company_id] => 17
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [38] => Array
  (
    [company_id] => 26
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [39] => Array
  (
    [company_id] => 25
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [40] => Array
  (
    [company_id] => 27
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [41] => Array
  (
    [company_id] => 28
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [42] => Array
  (
    [company_id] => 29
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [43] => Array
  (
    [company_id] => 18
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [44] => Array
  (
    [company_id] => 23
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [45] => Array
  (
    [company_id] => 20
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [46] => Array
  (
    [company_id] => 22
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [47] => Array
  (
    [company_id] => 19
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [48] => Array
  (
    [company_id] => 21
    [avg_company] =>
    [avg_product] =>
    [avg_service] =>
    [avg_price] =>
    [avg_rating] => 0
  )

  [49] => Array
  (
    [company_id] => 61
    [avg_company] => 5.00000
    [avg_product] => 5.00000
    [avg_service] => 5.00000
    [avg_price] => 5.00000
    [avg_rating_remark] => Excellent
    [avg_rating] => 5.0
  )

  [50] => Array
  (
    [company_id] => 55
    [avg_company] => 4.50000
    [avg_product] => 4.50000
    [avg_service] => 4.50000
    [avg_price] => 3.00000
    [avg_rating_remark] => Solid
    [avg_rating] => 4.1
  )

  [51] => Array
  (
    [company_id] => 40
    [avg_company] => 4.00000
    [avg_product] => 2.00000
    [avg_service] => 5.00000
    [avg_price] => 5.00000
    [avg_rating_remark] => Solid
    [avg_rating] => 4.0
  )
)
用户回调函数应返回整数，但此函数有时会尝试返回浮点值，浮点值会自动四舍五入。试一试

usort($ret, function($a, $b) {
  return $b['avg_rating'] > $a['avg_rating'];
});
我对此应用了解决方案，将我的
usort（）
语法替换为：

usort($ret, function($a, $b) {
  $a = $a['avg_rating'];
  $b = $b['avg_rating'];
if ($a == $b) { return 0; }
  return ($a < $b) ? -1 : 1;
});
我所做的是，我知道我的浮点数总是有一个小数点，所以这就是我所做的：

usort($dataArray,function($a,$b){

    return ($a*10) - ($b*10);
});
我现在明白了。用户回调函数应返回整数，但此函数有时会尝试返回浮点值，浮点值会自动四舍五入。请参阅更新的答案Good find mate！虽然我有一个自学的解决方案，但我发现这很有效。如果需要反转排序顺序，只需使用
（$aor）如果要反转，只需使用
而不是


usort($dataArray,function($a,$b){

    return ($a*10) - ($b*10);
});