将一维或多维的数组连接成一个字符串的php代码

/* 
* ————————————————- 
* @file : 5.php 
* @function : arr2str 
* @copyright : 2002-2009 Xingmo Inc 
* @author : Fanglor <fanglor#163.com> 
* @date : 2010-06-25 
* @update : 
* ————————————————- 
*/ 
<?php 
$fruits = array ( 
"fruits" => array("a" => "orange", "b" => "banana", "c" => "apple"), 
"numbers" => array(1, 2, 3, 4, 5, 6), 
"holes" => array("first", 5 => "second", "third") 
); 
$arr1 = array(1, 2, 3, 4, 5, 6=>'fanglor'); 
function arr2str ($arr) 
{ 
static $res_arr = array(); 
if (is_array ($arr)) 
{ 
foreach ($arr as $key => $val ) 
{ 
if (is_array($val)) 
{ 
arr2str ($val); 
} 
else 
{ 
$res_arr[] = $val; 
} 
} 
} 
elseif (is_string ($arr)) 
{ 
$res_arr[] = $arr; 
} 
return implode(',',$res_arr); 
} 
$str = arr2str ($arr1); 
print_r ($str); 
?>