php数组怎样转换成字符串，一维数组转换成字符串代码！

<?php
$arr1=array("shu","zhu","1");
$c=implode("##",$arr1);
echo $c;  //shu##zhu##1 
?>

二维数组转换成字符串代码

<?php
$arr=array(array("hu","peng","123456"));
$b=implode("##",$arr[0]);
echo $b; //hu##peng##123456
?>