回答編集履歴
1
niji
test
CHANGED
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@@ -37,3 +37,73 @@
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37
37
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*/
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38
38
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39
39
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```
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40
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41
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42
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43
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# 二次配列の場合
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44
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45
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二次配列でも考え方は同じ
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46
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47
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```PHP
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48
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49
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<?PHP
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50
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51
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$a=[
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52
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53
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['id' => '2' ,'category_id' => 'A',],
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54
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55
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['id' => '30' ,'category_id' => 'A',],
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56
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57
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['id' => '12' ,'category_id' => 'B',],
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58
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59
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['id' => '8' ,'category_id' => 'B',],
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60
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61
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['id' => '10' ,'category_id' => 'C',],
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62
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63
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['id' => '329' ,'category_id' => 'D',],
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64
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65
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['id' => '89' ,'category_id' => 'E',],
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66
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67
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['id' => '79' ,'category_id' => 'E',],
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68
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69
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['id' => '58' ,'category_id' => 'A',],
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70
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71
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['id' => '219' ,'category_id' => 'B',],
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72
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73
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['id' => '44' ,'category_id' => 'B',],
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74
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75
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['id' => '3219' ,'category_id' => 'B',],
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76
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77
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['id' => '231' ,'category_id' => 'B',],
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78
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79
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['id' => '43210','category_id' => 'F',],
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80
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81
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];
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82
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83
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$b=[];
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84
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85
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$c=[];
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86
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87
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while(count($a)>0){
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88
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89
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//shuffle($a);
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90
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91
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$category=isset($c["category_id"])?$c["category_id"]:null;
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92
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$a=array_merge(array_filter($a,function($x) use($category){
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return $x["category_id"]!=$category;
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97
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}),array_filter($a,function($x) use($category){
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98
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return $x["category_id"]==$category;
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100
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101
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}));
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102
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103
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$b[]=($c=array_splice($a,0,1)[0]);
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104
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105
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}
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106
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107
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print json_encode($b);
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108
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109
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```
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