多維數組轉一維數組

<?php
header('Content-type: text/html;charset=utf-8');	
$array = array('張三','李四','王五','趙六','趙虎',array('張龍'),array('lisi',array('liudan')));
foreach ($array as $key => $value) {
	//echo $key.'</br>';
	if ($key) {
		echo ',';
	}
	echo $value;
}


/**
 * 多維to一維
 * @param $array
 * @param string $k
 * @return array
 */
$arr = array('a' => 'liudan',array('liudan2222'), 'b' => 'li','c' => 'li2',array('a1' => '張三', 'b1' => '李四','c1' => '王五',array('d' => '張劉',array('liudan'),array('liudan2222'))));
function manytoone($array){
	$data = [];
	if (!is_array($array)) {
		return $data;
	}
	foreach ($array as $k => $v) {	
		if (is_array($v) ){
			$data = array_merge($data,manytoone($v));
		}else{
			$data[$k] = $v;
		}
	}
	return $data;	
}
$a = manytoone($arr);
print_r($a);
?>