php二维数组转化为字符串

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    //二维数组转化为字符串，中间用,隔开  
    function arr_to_str($arr){  
        foreach ($arr as $v){  
            $v = join(",",$v); //可以用implode将一维数组转换为用逗号连接的字符串，join是别名  
            $temp[] = $v;  
        }  
        foreach($temp as $v){  
            $t.=$v.",";  
        }  
        $t=substr($t,0,-1);  //利用字符串截取函数消除最后一个逗号  
        return $t;  
    }  

PS:

substr应用

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    $str = "1,2,3,4,5,6,";  
    $newstr = substr($str,0,strlen($str)-1);  
    echo $newstr;  

系统自带的函数也可实现这样的效果，两种方法：
1） substr($str, 0, -1);
2）rtrim($str, ",")