定义一个空数组的两种方法<br>索引数组，下标(键名)是从0开始的整数<br>Toyota<br>Array
(
    [0] => Volvo
    [1] => BMW
    [2] => Toyota
)
<br>Volvo,BMW,Toyota,关联数组，下标(键名)是字符串<br>37<br>Array
(
    [Peter] => 35
    [Ben] => 37
    [Joe] => 43
)
<br>二维索引数组<br>Volvo<br>5<br>Array
(
    [0] => Array
        (
            [0] => Volvo
            [1] => 22
            [2] => 18
        )

    [1] => Array
        (
            [0] => BMW
            [1] => 15
            [2] => 13
        )

    [2] => Array
        (
            [0] => Saab
            [1] => 5
            [2] => 2
        )

    [3] => Array
        (
            [0] => Land Rover
            [1] => 17
            [2] => 15
        )

)
<br>遍历二维索引数组输出每个元素方法一<br>Volvo,22,18,BMW,15,13,Saab,5,2,Land Rover,17,15,遍历二维索引数组输出每个元素方法二<br>Volvo,22,18,BMW,15,13,Saab,5,2,Land Rover,17,15,二维关联数组，下标(键名)是字符串， 键名是字符串至少有一个字符<br>Volvo<br>Array
(
    [a] => Array
        (
            [0] => Volvo
            [1] => 22
            [2] => 18
        )

    [b] => Array
        (
            [0] => BMW
            [1] => 15
            [2] => 13
        )

    [c] => Array
        (
            [0] => Saab
            [1] => 5
            [2] => 2
        )

    [d] => Array
        (
            [0] => Land Rover
            [1] => 17
            [2] => 15
        )

)
<br>4<br>遍历二维关联数组<br>$car3[a][0] = Volvo<br>$car3[a][1] = 22<br>$car3[a][2] = 18<br>$car3[b][0] = BMW<br>$car3[b][1] = 15<br>$car3[b][2] = 13<br>$car3[c][0] = Saab<br>$car3[c][1] = 5<br>$car3[c][2] = 2<br>$car3[d][0] = Land Rover<br>$car3[d][1] = 17<br>$car3[d][2] = 15<br>数组排序<br>Array
(
    [0] => Volvo
    [1] => Toyota
    [2] => Honda
    [3] => BMW
)
<br>Volvo<br>Toyota<br>Honda<br>BMW<br>$cars4[0] = Volvo<br>$cars4[1] = Toyota<br>$cars4[2] = Honda<br>$cars4[3] = BMW<br>合并数组函数array_merge()<br>Array
(
    [a] => red
    [b] => green
    [c] => blue
    [d] => yellow
    [e] => red
    [f] => green
    [g] => blue
    [h] => yellow
)
<br>数组转换字符串函数implode()<br>a,b,c,d,e<br>字符串转换数组函数explode()<br>Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => d
    [4] => e
)
<br>将数据库的数据插入数组<br>输出$data[labels]数据<br>Array
(
)
<br>输出$data['datasets'][0]['data']<br>Array
(
)
<br>输出$data所有数据<br>Array
(
    [labels] => Array
        (
        )

    [datasets] => Array
        (
            [0] => Array
                (
                    [label] => 最近10天黄金价格
                    [data] => Array
                        (
                        )

                    [backgroundColor] => rgba(255, 99, 132, 0.6)
                    [borderColor] => rgba(255, 99, 132, 1)
                    [borderWidth] => 1
                )

        )

)
关联数组，下标(键名)是字符串<br>37<br>43<br>Array
(
    [Peter] => 35
    [Ben] => 37
    [Joe] => 43
)
<br>Array
(
    [labels] => Array
        (
            [aa] => aa
            [bb] => bb
        )

    [datasets] => Array
        (
            [label] => 最近10天黄金价格
            [data] => Array
                (
                )

        )

)
<br>最近10天黄金价格<br>Array
(
    [labels] => Array
        (
            [aa] => aa
            [bb] => bb
        )

    [datasets] => Array
        (
            [0] => Array
                (
                    [label] => 最近10天黄金价格
                    [data] => Array
                        (
                        )

                )

        )

)
<br>最近10天黄金价格<br>将数据库的数据插入数组<br>输出$data[labels]数据<br>Array
(
)
<br>输出$data['datasets'][0]['data']<br>Array
(
)
<br>输出$data所有数据<br>Array
(
    [labels] => Array
        (
        )

    [datasets] => Array
        (
            [0] => Array
                (
                    [label] => 最近10天黄金价格
                    [data] => Array
                        (
                        )

                    [backgroundColor] => rgba(255, 99, 132, 0.6)
                    [borderColor] => rgba(255, 99, 132, 1)
                    [borderWidth] => 1
                )

        )

)