从while循环php中选择项目

while (condition) {
    // 循环体，当condition为true时执行
}

$i = 0;
while ($i < 5) {
    echo $i;
    $i++;
}

$numbers = [1, 2, 3, 4, 5];
$index = 0;

while ($index < count($numbers)) {
    if ($numbers[$index] % 2 == 0) {
        echo "偶数: " . $numbers[$index] . "\n";
    } else {
        echo "奇数: " . $numbers[$index] . "\n";
    }
    $index++;
}

$i = 0;
while ($i < 10) { // 确保$i最终会达到10，从而退出循环
    echo $i;
    $i++;
}

$items = ['a', 'b', 'c'];
$index = 0;

while ($index < count($items)) {
    echo $items[$index];
    $index++;
}

$data = [
    ['name' => 'Alice', 'age' => 25],
    ['name' => 'Bob', 'age' => 30],
    ['name' => 'Charlie', 'age' => 20]
];

$index = 0;

while ($index < count($data)) {
    $person = $data[$index];
    if ($person['age'] >= 25) {
        echo "成年人: " . $person['name'] . "\n";
    } else {
        echo "未成年人: " . $person['name'] . "\n";
    }
    $index++;
}