PHP 流程控制

$score = 85;

if ($score >= 90) {
    echo "优秀";
} elseif ($score >= 60) {
    echo "及格";
} else {
    echo "不及格";
}
?>
``

switch
`php
<?php
$day = "Monday";

switch ($day) {
    case "Monday":
        echo "星期一";
        break;
    case "Friday":
        echo "星期五";
        break;
    default:
        echo "其他";
}
?>
`

循环
for 循环
`php
<?php
for ($i = 0; $i < 5; $i++) {
    echo $i . " ";
}
// 输出: 0 1 2 3 4
?>
`

while 循环
`php
<?php
$i = 0;
while ($i < 3) {
    echo $i++;
}
?>
`

foreach 循环
``php
<?php
$fruits = ["苹果", "香蕉", "橙子"];
foreach ($fruits as $fruit) {
    echo $fruit . "\n";
}