range() 函數根據范圍創(chuàng)建數組，包含指定的元素
range ( $low, $high [, $step] );
此函數返回從low到high（包括low和high值）的元素數組。如果low > high，順序將從高到低。
| 序號 | 參數及說明 |
|---|---|
| 1 | low(必需) 這是數組的下限 |
| 2 | high(必需) 這是數組的上限 |
| 3 | step(可選) 增加數組元素的步驟。默認為1 |
它返回元素數組，返回的數組中從 low 到 high （含 low 和 high）的元素。
<?php
foreach (range(0, 6) as $number) {
echo "$number, ";
}
print "\n";
foreach (range(0, 100, 10) as $number) {
echo "$number, ";
}
print "\n";
foreach (range('a', 'c') as $letter) {
echo "$letter, ";
}
print "\n";
foreach (range('f', 'a') as $letter) {
echo "$letter, ";
}
print "\n";
?>測試看看?/?輸出結果：
0, 1, 2, 3, 4, 5, 6, 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 a, b, c, f,e,d,c, b, a