php 数组类型转换

// 数组到字符串
$array = ['apple', 'banana', 'cherry'];
$string = implode(', ', $array);
echo $string; // 输出: apple, banana, cherry

// 字符串到数组
$string = 'apple,banana,cherry';
$array = explode(', ', $string);
print_r($array); // 输出: Array ( [0] => apple [1] => banana [2] => cherry )

// 数组到对象
$array = ['name' => 'John', 'age' => 30];
$object = json_decode(json_encode($array));
print_r($object); // 输出: stdClass Object ( [name] => John [age] => 30 )

// 对象到数组
class Person {
    public $name = 'John';
    public $age = 30;
}
$object = new Person();
$array = get_object_vars($object);
print_r($array); // 输出: Array ( [name] => John [age] => 30 )

// 多维数组到一维数组
$multiArray = [['a', 'b'], ['c', 'd']];
$flattenedArray = [];
array_walk_recursive($multiArray, function($value) use (&$flattenedArray) {
    $flattenedArray[] = $value;
});
print_r($flattenedArray); // 输出: Array ( [0] => a [1] => b [2] => c [3] => d )