一週有7天；Sunday、Monday、Tuesday、Wednesday、Thursday、Friday、Saturday、<br>foreach 用法：Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, <p>Array
(
    [0] => Sunday
    [1] => Monday
    [2] => Tuesday
    [3] => Wednesday
    [4] => Thursday
    [5] => Friday
    [6] => Saturday
)
<p>mealArray=Count, 總和=0<br>sort排序結果:<br>Array
(
    [0] => Array
        (
            [0] => Monday
            [1] => 星期一
            [2] => 蘋果
            [3] => 3
        )

    [1] => Array
        (
            [0] => Sunday
            [1] => 星期三
            [2] => 檸檬
            [3] => 5
        )

    [2] => Array
        (
            [0] => Sunday
            [1] => 星期五
            [2] => 芭樂
            [3] => 7
        )

    [3] => Array
        (
            [0] => Sunday
            [1] => 星期六
            [2] => 番茄
            [3] => 10
        )

    [4] => Array
        (
            [0] => Sunday
            [1] => 星期四
            [2] => 梨
            [3] => 15
        )

    [5] => Array
        (
            [0] => Sunday
            [1] => 星期日
            [2] => 香蕉
            [3] => 7
        )

    [6] => Array
        (
            [0] => Tuesday
            [1] => 星期二
            [2] => 鳳梨
            [3] => 2
        )

)
<br>usort 排序結果:<br><table border=n><caption>用表格表示</caption><tr><td>0</td><td>Tuesday</td><td>星期二</td><td>鳳梨</td><td>2</td></tr><tr><td>1</td><td>Monday</td><td>星期一</td><td>蘋果</td><td>3</td></tr><tr><td>2</td><td>Sunday</td><td>星期三</td><td>檸檬</td><td>5</td></tr><tr><td>3</td><td>Sunday</td><td>星期五</td><td>芭樂</td><td>7</td></tr><tr><td>4</td><td>Sunday</td><td>星期日</td><td>香蕉</td><td>7</td></tr><tr><td>5</td><td>Sunday</td><td>星期六</td><td>番茄</td><td>10</td></tr><tr><td>6</td><td>Sunday</td><td>星期四</td><td>梨</td><td>15</td></tr></table><pre>反向排序：Array
(
    [0] => Array
        (
            [Eng] => Thursday
            [Cht] => 星期四
            [Fruit] => 梨
            [price] => 15
        )

    [1] => Array
        (
            [Eng] => Saturday
            [Cht] => 星期六
            [Fruit] => 番茄
            [price] => 10
        )

    [2] => Array
        (
            [Eng] => Sunday
            [Cht] => 星期日
            [Fruit] => 香蕉
            [price] => 7
        )

    [3] => Array
        (
            [Eng] => Friday
            [Cht] => 星期五
            [Fruit] => 芭樂
            [price] => 7
        )

    [4] => Array
        (
            [Eng] => Wednesday
            [Cht] => 星期三
            [Fruit] => 檸檬
            [price] => 5
        )

    [5] => Array
        (
            [Eng] => Monday
            [Cht] => 星期一
            [Fruit] => 蘋果
            [price] => 3
        )

    [6] => Array
        (
            [Eng] => Tuesday
            [Cht] => 星期二
            [Fruit] => 鳳梨
            [price] => 2
        )

)
1</pre>