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###辅助函数

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av
###集合可用方法

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map	collapse	avg	has	max	min	toJson	toArray	take	pluck
where

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map

遍历整个集合，并将key于val数值传入至回调函数；并且可以在回调函数中return来修改值；

$vcollect = vcollect([1, 2, 3, 4]);
$vcollect->map(function($key, $value) {
    return $key+$value;
    });
//[1, 3, 5, 7]

collapse

将集合转换为一维数组

$vcollect = vcollect([1, 2, [3, 4]]);
$vcollect->collapse();

你将得到：

[1, 2, 3, 4]

avg

1、返回集合中所有项的平均值

$vcollect = vcollect([1, 2, 3, 4, 5]);
$vcollect->avg();

您将得到一个整型或浮点型结果

(int)3

2、当然你也可以通过传递键来计算平均值

$vcollect = vcollect([
        ['a'=>4],
        ['a'=>6],
        8   
    ]);
$vcollect->avg('a');

您将得到一个整型或浮点型结果

(int)5

has

检查集合中是否含有指定的键

$vcollect = vcollect(['account_id' => 1, 'product' => 'Desk']);

$vcollect->has('email');

// false

max

返回集合中的最大值

$vcollect = vcollect([1,2,3,4,5]);

$vcollect->max();

//(int)5

你也可以通过传入键值来获取二维数组中指定键的最大值

$vcollect = vcollect([
        ['a'=>1.1],
        ['a'=>4],
        ['a'=>8]
    ]
);
$vcollect->max('a');

//(int)8

min

返回集合中的最小值

$vcollect = vcollect([1,2,3,4,5]);

$vcollect->min();

//(int)1

你也可以通过传入键值来获取指定键的最小值

$vcollect = vcollect([
        ['a'=>1.1],
        ['a'=>4],
        ['a'=>8]
    ]
);
$vcollect->min('a');

//(float)1.1

toJson

将集合进行JSON编码

$vcollect = vcollect([
        'a'=>4,
        [1, 'a'=>2, 3],
        [4, [ 5, 'a'=>6 ]]
    ]);

$vcollect->toJson();

//(string)'{"a":4,"0":{"0":1,"a":2,"1":3},"1":[4,{"0":5,"a":6}]}'

toArray

将集合结果转换为数组

$vcollect = vcollect([
        'a'=>4,
        [1, 'a'=>2, 3],
        [4, [ 5, 'a'=>6 ]]
    ]);

$vcollect->collapse()->toArray();

//结果：
//array (size=6)
//  0 => int 4
//  1 => int 1
//  2 => int 2
//  3 => int 3
//  4 => int 4
//  5 => 
//    array (size=2)
//     0 => int 5
//     'a' => int 6

take

获取指定数量的集合

$vcollect = vcollect([1,2,3,4,5]);

$vcollect->take(1)->toArray();

//(array)[1]

也可以通过传入负数从集合后面获取指定数量的集合

$vcollect->take(-2)->toArray();

//(array)[4, 5]

pluck

快速获取多层集合中指定「键」所有对应的值：

$vcollect = vcollect([
    ['developer' => ['name' => 'Taylor'], 'id' => 2],
    ['developer' => ['name' => 'Abigail'], 'id' => 5]
]);

$vcollect->pluck('developer.name');

//['Taylor', 'Abigail']

你也可以指定结果集的键

$vcollect->pluck('developer.name', 'id');

//[2=>'Taylor', 5=>'Abigail']

where

快速过滤或筛选集合

$vcollect = vcollect([
    ['developer' => ['name' => 'Taylor'], 'id' => 2],
    ['developer' => ['name' => 'Abigail'], 'id' => 5]
]);

$vcollect->where('developer.name', 'Taylor')->toArray();

//[ ['developer' => ['name' => 'Taylor'], 'id' => 2] ]

---

###辅助函数

av

快速获取数组值，并创建变量；

语法糖：av(['数组值' => '变量名', .....], [数据源])

av(
    ['Taylor.developer.web.back_end' => 'Taylor_web_back_end', ],

    [
    'Taylor' => ['developer' => ['web' => ['back_end' => ['PHP', 'JAVA']], 'ios' => 'swift'], 'id' => 1],
    'Abigail' => ['developer' => ['web' => ['back_end' => ['PHP', 'ASP']], 'ios' => 'object-c'], 'id' => 2]
    ]
);

当你访问 $Taylor_web_back_end 变量的时候，你将会得到 ['PHP', 'JAVA'];