<?php
function upload($save_path,$custom_upload_max_filesize,$key,$type=array('jpg','jpeg','gif','png','txt')){
$return_data=array();
//获取phpini配置文件里面的upload_max_filesize值
$phpini=ini_get('upload_max_filesize');
//获取phpini配置文件里面的upload_max_filesize值的单位
$phpini_unit=strtoupper(substr($phpini,-1));
//获取phpini配置文件里面的upload_max_filesize值的数字部分
$phpini_number=substr($phpini,0,-1);
//计算出转换成字节应该乘以的倍数
$phpini_multiple=get_multiple($phpini_unit);
//转换成字节
$phpini_bytes=$phpini_number*$phpini_multiple;
$custom_unit=strtoupper(substr($custom_upload_max_filesize,-1));
$custom_number=substr($custom_upload_max_filesize,0,-1);
$custom_multiple=get_multiple($custom_unit);
$custom_bytes=$custom_number*$custom_multiple;
if($custom_bytes>$phpini_bytes){
$return_data['error']='传入的$custom_upload_max_filesize大于PHP配置文件里面的'.$phpini;
$return_data['return']=false;
return $return_data;
}
$arr_errors=array(
1=>'上传的文件超过了 php.ini中 upload_max_filesize 选项限制的值',
2=>'上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值',
3=>'文件只有部分被上传',
4=>'没有文件被上传',
6=>'找不到临时文件夹',
7=>'文件写入失败'
);
if(!isset($_FILES[$key]['error'])){
$return_data['error']='由于未知原因导致，上传失败，请重试！';
$return_data['return']=false;
return $return_data;
}
if ($_FILES[$key]['error']!=0) {
$return_data['error']=$arr_errors[$_FILES['error']];
$return_data['return']=false;
return $return_data;
}
if(!is_uploaded_file($_FILES[$key]['tmp_name'])){
$return_data['error']='您上传的文件不是通过 HTTP POST方式上传的！';
$return_data['return']=false;
return $return_data;
}
if($_FILES[$key]['size']>$custom_bytes){
$return_data['error']='上传文件的大小超过了程序作者限定的'.$custom_upload_max_filesize;
$return_data['return']=false;
return $return_data;
}
$arr_filename=pathinfo($_FILES[$key]['name']);
if(!isset($arr_filename['extension'])){
$arr_filename['extension']='';
}
if(!in_array($arr_filename['extension'],$type)){
$return_data['error']='上传文件的后缀名必须是'.implode(',',$type).'这其中的一个';
$return_data['return']=false;
return $return_data;
}
if(!file_exists($save_path)){
if(!mkdir($save_path,0777,true)){
$return_data['error']='上传文件保存目录创建失败，请检查权限!';
$return_data['return']=false;
return $return_data;
}
}
$new_filename=str_replace('.','',uniqid(mt_rand(100000,999999),true));
if($arr_filename['extension']!=''){
$new_filename.=".{$arr_filename['extension']}";
}
$save_path=rtrim($save_path,'/').'/';
if(!move_uploaded_file($_FILES[$key]['tmp_name'],$save_path.$new_filename)){
$return_data['error']='临时文件移动失败，请检查权限!';
$return_data['return']=false;
return $return_data;
}
$return_data['save_path']=$save_path.$new_filename;
$return_data['filename']=$new_filename;
$return_data['return']=true;
return $return_data;
}
function get_multiple($unit){
switch ($unit){
case 'K':
$multiple=1024;
return $multiple;
case 'M':
$multiple=1024*1024;
return $multiple;
case 'G':
$multiple=1024*1024*1024;
return $multiple;
default:
return false;
}
}
header("Content-type:text/html;charset=utf-8");
if(isset($_POST['submit'])){
$upload=upload('a/b/c','2M','myfile');
if(!$upload['return']){
var_dump($upload['error']);
}else{
echo '上传成功！';
}
}
?>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8" />
<title>上传页面</title>
</head>
<body>
<form action="" method="post" enctype="multipart/form-data">
<input type="file" name="myfile" />
<input type="submit" name="submit" value="开始上传" />
</form>
</body>
</html>
