How to use code to recursively obtain the value of a specified key in an array through PHP

In PHP, we often encounter the need to obtain the key value in an array, so this article will explain the relevant knowledge.

/**
 * 递归获取一个数组中指定key的值
 * @param $array
 * @param $keys
 * @param string $delimiter
 * @return mixed
 */
function get_deep_value($array, $keys, $delimiter = '.')
{
    $keys = explode($delimiter, $keys);
    $key = array_shift($keys);
    if (sizeof($keys) > 0 && isset($array[$key])) {
        return get_deep_value($array[$key], implode($delimiter, $keys), $delimiter);
    } else {
        return $array[$key] ?? null;
    }
}
 
$a = [
    'a' => [
        'b' => 'error',
        'c' => [
            'd' => [
                'e' => [
                    'f' => 'ok',
                ]
            ]
        ]
    ]
]; 
var_dump(get_deep_value($a, 'a.c.d.e.f'));
/**
 * 输出：
 * string(2) "ok"
 */
var_dump(get_deep_value($a, 'a.b'));
/**
 * 输出：
 * string(5) "error"
 */
var_dump(get_deep_value($a, 'a.b.c'));
/**
 * 输出：
 * NULL
 */

This article lists the relevant methods of recursively obtaining the value of a specified key in an array through PHP code. For more related knowledge, please pay attention to the PHP Chinese website.

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