如何获取关联数组的多个实例？

<?php
// 关联数组
$students = array(
    array(
        'name' => 'Alice',
        'age' => 20,
        'gender' => 'female'
    ),
    array(
        'name' => 'Bob',
        'age' => 22,
        'gender' => 'male'
    ),
    array(
        'name' => 'Charlie',
        'age' => 21,
        'gender' => 'male'
    )
);

// 遍历数组
foreach ($students as $student) {
    echo "Name: " . $student['name'] . ", Age: " . $student['age'] . ", Gender: " . $student['gender'] . "\n";
}

// 使用数组函数
$values = array_values($students);
$keys = array_keys($students);
$slice = array_slice($students, 0, 2);

// 使用array_column()函数
$names = array_column($students, 'name');

// 打印结果
print_r($values);
print_r($keys);
print_r($slice);
print_r($names);
?>