How to sort a two-dimensional array in PHP by a specific key value?

In PHP, you can use the array_multisort() function to sort a two-dimensional array by a certain key value. Here is an example code:

// 创建一个二维数组
$students = array(
    array('name' => 'Alice', 'age' => 20),
    array('name' => 'Bob', 'age' => 18),
    array('name' => 'Charlie', 'age' => 22)
);

// 获取要排序的键值
foreach ($students as $key => $row) {
    $age[$key] = $row['age'];
}

// 使用array_multisort()函数对数组进行排序
array_multisort($age, SORT_ASC, $students);

// 打印排序后的数组
print_r($students);

In the example above, we start by creating a two-dimensional array $students, then use the array_multisort() function to sort the array in ascending order based on the age key. Finally, print the sorted array to see the results of sorting based on the age key.