课程进度 19% · 第5/22章第5/22章 · 标签 1/4
— 1 —
条件判断
- if/else、elseif结构
- 三元运算符 ?:
- switch多分支选择
php
1
2
$a = 10;
3
if ($a > 5) { echo "大于5"; }
4
elseif ($a == 5) { echo "等于5"; }
5
else { echo "小于5"; }
6
$b = ($a > 0) ? "正数" : "非正数";
7
switch ($a) {
8
case 1: echo "一"; break;
9
case 2: echo "二"; break;
10
default: echo "其他";
11
}
12
— 2 —
循环结构
- for、while、do...while循环
- foreach遍历数组
- break、continue控制循环
php
1
2
for ($i = 0; $i < 3; $i++) { echo $i; }
3
$j = 0; while ($j < 3) { echo $j; $j++; }
4
$k = 0; do { echo $k; $k++; } while ($k < 3);
5
$arr = [1,2,3];
6
foreach ($arr as $v) { echo $v; }
7
foreach ($arr as $i => $v) { echo "$i:$v "; }
8
ifelseswitchforforeachwhile