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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