php上传文件,创建递归目录的实例代码

<?php
$uid=$_REQUEST['uid'];
$avatar = 'D:/avic/discuz/uc_server/data/avatar/'.get_avatar($uid, $size, $type);
$dir=dirname($avatar);
//创建目录成功后移动临时文件
if(mkdirs($dir)){

if($_FILES["pic"]["error"] >= 0){


if(move_uploaded_file($_FILES['pic']['tmp_name'],$avatar)){



$errorcode=1;


}else{



$errorcode=0;



$errormsg="文件移动失败";


}

}else{


$errorcode=0;


$errormsg=$_FILES['pic']['error'];

}
}
$back=array("errorcode"=>$errorcode,'errormsg'=>$errormsg);
echo json_encode($back);
//返回图片要存储的路径
function get_avatar($uid, $size = 'middle', $type = '') {

$size = in_array($size, array('big', 'middle', 'small')) ? $size : 'middle';

$uid = abs(intval($uid));

$uid = sprintf("%09d", $uid);

$dir1 = substr($uid, 0, 3);

$dir2 = substr($uid, 3, 2);

$dir3 = substr($uid, 5, 2);

$typeadd = $type == 'real' ? '_real' : '';

return $dir1.'/'.$dir2.'/'.$dir3.'/'.substr($uid, -2).$typeadd."_avatar_$size.jpg";
}
//递归创建目录，若传的$dir不是绝对路径，则会和运行此方法的目录同级
function mkdirs($dir){

if(!is_dir($dir)){


if(!mkdirs(dirname($dir))){



return false;


}

　if(!mkdir($dir,0777)){



return false;


}

　}
return true;
}
?>