PHP method to convert multi-dimensional array to string and multi-dimensional array to one-dimensional array, multi-dimensional_PHP tutorial

/** 
* @method 多维数组转字符串 
* @param type $array 
* @return type $srting 
* @author yanhuixian 
*/ 
function arrayToString($arr) { 
if (is_array($arr)){ 
return implode(',', array_map('arrayToString', $arr)); 
} 
return $arr; 
} 
/** 
* @method 多维数组变成一维数组 
* @staticvar array $result_array 
* @param type $array 
* @return type $array 
* @author yanhuixian 
*/ 
function multi2array($array) { 
static $result_array = array(); 
foreach ($array as $key => $value) { 
if (is_array($value)) { 
array_multi2array($value); 
} 
else 
$result_array[$key] = $value; 
} 
return $result_array; 
}