php实现文件上传

<?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>
posted @ 2019-04-24 10:39 Soraka-m 阅读(446) 评论(0) 收藏举报
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Soraka-m

php实现文件上传

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