程式設計@筆記

[php]sort — 對陣列排序
官方範例
<?php
$fruits = array("lemon", "orange", "banana", "apple");
sort($fruits);
foreach ($fruits as $key => $val) {
    echo "fruits[".$key."] = " . $val . "\n";
}
?>
以上例程會輸出：
fruits[0] = apple
fruits[1] = banana
fruits[2] = lemon
fruits[3] = orange

[php]shuffle — 將陣列打亂
範例
<?php
$my_array = array("a" => "Dog", "b" => "Cat", "c" => "Horse");
shuffle($my_array);
print_r($my_array);
?>
輸出：
Array ( [0] => Cat [1] => Horse [2] => Dog )

[php]rsort — 對陣列逆向排序
官方範例
<?php
$fruits = array("lemon", "orange", "banana", "apple");
rsort($fruits);
foreach ($fruits as $key => $val) {
    echo "$key = $val\n";
}
?>
以上例程會輸出：
0 = orange
1 = lemon
2 = banana
3 = apple

[php]reset — 將陣列的內部指針指向第一個單元
官方範例
<?php
$array = array('step one', 'step two', 'step three', 'step four');
// by default, the pointer is on the first element
echo current($array) . "<br />\n"; // "step one"
// skip two steps
next($array);
next($array);
echo current($array) . "<br />\n"; // "step three"
// reset pointer, start again on step one
reset($array);
echo current($array) . "<br />\n"; // "step one"
?>

[php]range — 建立一個包含指定範圍單元的陣列
官方範例
<?php
// array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
foreach (range(0, 12) as $number) {
    echo $number;
}
// The step parameter was introduced in 5.0.0
// array(0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100)
foreach (range(0, 100, 10) as $number) {
    echo $number;
}
// Use of character sequences introduced in 4.1.0
// array('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i');
foreach (range('a', 'i') as $letter) {
    echo $letter;
}
// array('c', 'b', 'a');
foreach (range('c', 'a') as $letter) {
    echo $letter;
}

[php]prev — 將陣列的內部指針倒回一位
官方範例
<?php
$transport = array('foot', 'bike', 'car', 'plane');
$mode = current($transport); // $mode = 'foot';
$mode = next($transport);    // $mode = 'bike';
$mode = next($transport);    // $mode = 'car';
$mode = prev($transport);    // $mode = 'bike';
$mode = end($transport);     // $mode = 'plane';
?>

[php]next — 將陣列中的內部指針向前移動一位
官方範例
<?php
$transport = array('foot', 'bike', 'car', 'plane');
$mode = current($transport); // $mode = 'foot';
$mode = next($transport);    // $mode = 'bike';
$mode = next($transport);    // $mode = 'car';
$mode = prev($transport);    // $mode = 'bike';
$mode = end($transport);     // $mode = 'plane';
?>

[php]natsort — 用「自然排序」算法對陣列排序
註：此函數有分大小寫
官方範例
<?php
$array1 = $array2 = array("img12.png", "img10.png", "img2.png", "img1.png");
sort($array1);
echo "Standard sorting\n";
print_r($array1);
natsort($array2);
echo "\nNatural order sorting\n";
print_r($array2);
?>
以上例程會輸出：
Standard sorting
Array
(
    [0] => img1.png
    [1] => img10.png
    [2] => img12.png
    [3] => img2.png
)
Natural order sorting
Array
(
    [3] => img1.png
    [2] => img2.png
    [1] => img10.png
    [0] => img12.png
)

[php]natcasesort() 函數用不區分大小寫的自然順序算法對給定陣列中的元素排序。
natcasesort() 函數實現了「自然排序」，即數字從 1 到 9 的排序方法，字母從 a 到 z 的排序方法，短者優先，該函數不區分大小寫。陣列的索引與單元值保持關聯。
如果成功，則該函數返回 TRUE，否則返回 FALSE。
官方範例
<?php
$array1 = $array2 = array('IMG0.png', 'img12.png', 'img10.png', 'img2.png', 'img1.png', 'IMG3.png');
sort($array1);
echo "Standard sorting\n";
print_r($array1);
natcasesort($array2);
echo "\nNatural order sorting (case-insensitive)\n";
print_r($array2);
?>
以上例程會輸出：
Standard sorting
Array
(
    [0] => IMG0.png
    [1] => IMG3.png
    [2] => img1.png
    [3] => img10.png
    [4] => img12.png
    [5] => img2.png
)
Natural order sorting (case-insensitive)
Array
(
    [0] => IMG0.png
    [4] => img1.png
    [3] => img2.png
    [5] => IMG3.png
    [2] => img10.png
    [1] => img12.png
)

[php]list — 把陣列中的值賦給一些變量
官方範例
<?php
$info = array('coffee', 'brown', 'caffeine');
// Listing all the variables
list($drink, $color, $power) = $info;
echo "$drink is $color and $power makes it special.\n";
輸出：coffee is brown and caffeine makes it special.
// Listing some of them
list($drink, , $power) = $info;
echo "$drink has $power.\n";
輸出：coffee has caffeine.
// Or let's skip to only the third one
list( , , $power) = $info;
echo "I need $power!\n";
輸出：I need caffeine!
?>