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Example PHP implements encapsulation of single file, multiple single files, and multi-file upload functions

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Jul 22, 2020 pm 04:44 PM

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Example PHP implements encapsulation of single file, multiple single files, and multi-file upload functions

The example of this article describes the encapsulation of single file, multiple single files, and multi-file upload functions in PHP. Share it with everyone for your reference, the details are as follows:

Form:

s.php

To be able to select multiple files at one time when selecting to upload file, then add multiple="multiple", and pay attention to the difference between name="myFile1" and name="myFile[]". File, multiple file upload.

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<body>
<form action="sss.php" method="post" enctype="multipart/form-data">
  <input type="file" name="myFile1" /><br/>
  <input type="file" name="myFile2" /><br/>
  <input type="file" name="myFile[]" /><br/>
  <input type="file" name="myFile[]" /><br/>
  <input type="file" name="myFile[]" multiple="multiple"/><br/>
  <input type="submit" value="上传文件"/>
</form>
</body>
</html>

Encapsulation of upload function:

ss.php

<?php
header(&#39;Content-Type:text/html;charset=utf-8&#39;);
//构建上传文件信息
function getFiles(){
    $i=0;
    foreach($_FILES as $file){
        //因为这时$_FILES是个三维数组，并且上传单文件或多文件时，数组的第一维的类型不同，这样就可以拿来判断上传的是单文件还是多文件
        if(is_string($file[&#39;name&#39;])){
        //如果是单文件
            $files[$i]=$file;
            $i++;
        }elseif(is_array($file[&#39;name&#39;])){
        //如果是多文件
            foreach($file[&#39;name&#39;] as $key=>$val){
                $files[$i][&#39;name&#39;]=$file[&#39;name&#39;][$key];
                $files[$i][&#39;type&#39;]=$file[&#39;type&#39;][$key];
                $files[$i][&#39;tmp_name&#39;]=$file[&#39;tmp_name&#39;][$key];
                $files[$i][&#39;error&#39;]=$file[&#39;error&#39;][$key];
                $files[$i][&#39;size&#39;]=$file[&#39;size&#39;][$key];
                $i++;
            }
        }
    }
    return $files;
}
//针对于单文件、多个单文件、多文件的上传
//默认允许上传的文件只为图片类型，并且只有这些图片类型:$allowExt=array(&#39;jpeg&#39;,&#39;jpg&#39;,&#39;png&#39;,&#39;gif&#39;);并且检查上传的文件是否为真实的图片$flag=true
//默认上传保存的文件夹为本地的&#39;uploads&#39;文件夹，允许上传文件的大小最大为2M
function uploadFile($fileInfo,$path=&#39;./uploads&#39;,$flag=true,$allowExt=array(&#39;jpeg&#39;,&#39;jpg&#39;,&#39;png&#39;,&#39;gif&#39;),$maxSize=2097152){
    //判断错误号
    if($fileInfo[&#39;error&#39;]===UPLOAD_ERR_OK){
        //检测上传文件的大小
        if($fileInfo[&#39;size&#39;]>$maxSize){
            $res[&#39;mes&#39;]=$fileInfo[&#39;name&#39;].&#39;上传文件过大&#39;;
        }
        $ext=getExt($fileInfo[&#39;name&#39;]);
        //检测上传文件的文件类型
        if(!in_array($ext,$allowExt)){
            $res[&#39;mes&#39;]=$fileInfo[&#39;name&#39;].&#39;非法文件类型&#39;;
        }
        //检测是否是真实的图片类型
        if($flag){
            if(!getimagesize($fileInfo[&#39;tmp_name&#39;])){
                $res[&#39;mes&#39;]=$fileInfo[&#39;name&#39;].&#39;不是真实图片类型&#39;;
            }
        }
        //检测文件是否是通过HTTP POST上传上来的
        if(!is_uploaded_file($fileInfo[&#39;tmp_name&#39;])){
            $res[&#39;mes&#39;]=$fileInfo[&#39;name&#39;].&#39;文件不是通过HTTP POST方式上传上来的&#39;;
        }
        if( $res ) return $res; //如果要不显示错误信息的话，用if( @$res ) return $res;
        //$path=&#39;./uploads&#39;;
        //如果没有这个文件夹，那么就创建一
        if(!file_exists($path)){
            mkdir($path,0777,true);
            chmod($path,0777);
        }
        //新文件名唯一
        $uniName=getUniName();
        $destination=$path.&#39;/&#39;.$uniName.&#39;.&#39;.$ext;
        //@符号是为了不让客户看到错误信，也可以删除
        if(!@move_uploaded_file($fileInfo[&#39;tmp_name&#39;],$destination)){
            $res[&#39;mes&#39;]=$fileInfo[&#39;name&#39;].&#39;文件移动失败&#39;;
        }
        $res[&#39;mes&#39;]=$fileInfo[&#39;name&#39;].&#39;上传成功&#39;;
        $res[&#39;dest&#39;]=$destination;
        return $res;
    }else{
        //匹配错误信息
        //注意！错误信息没有5
        switch($fileInfo[&#39;error&#39;]){
            case 1:
                $res[&#39;mes&#39;] = &#39;上传文件超过了PHP配置文件中upload_max_filesize选项的值&#39;;
                break;
            case 2:
                $res[&#39;mes&#39;] = &#39;超过了HTML表单MAX_FILE_SIZE限制的大小&#39;;
                break;
            case 3:
                $res[&#39;mes&#39;] = &#39;文件部分被上传&#39;;
                break;
            case 4:
                $res[&#39;mes&#39;] = &#39;没有选择上传文件&#39;;
                break;
            case 6:
                $res[&#39;mes&#39;] = &#39;没有找到临时目录&#39;;
                break;
            case 7:
                $res[&#39;mes&#39;] = &#39;文件写入失败&#39;;
                break;
            case 8:
                $res[&#39;mes&#39;] = &#39;上传的文件被PHP扩展程序中断&#39;;
                break;
        }
        return $res;
    }
}
?>

common.ss.php

<?php
//这两函数也可以一起放到ss.php里面去
//得到文件扩展名
function getExt($filename){
    return strtolower(pathinfo($filename,PATHINFO_EXTENSION));
}
//产生唯一字符串
function getUniName(){
    return md5(uniqid(microtime(true),true));
}
?>

Operation of files after uploading:

<?php
header("content-type:text/html;charset=utf-8");
require_once &#39;ss.php&#39;;
require_once &#39;common.ss.php&#39;;
$files=getFiles();
//修改允许上传文件的类型，为(&#39;jpeg&#39;,&#39;jpg&#39;,&#39;png&#39;,&#39;gif&#39;,&#39;html&#39;,&#39;txt&#39;)，也可以增加新的，如pdf，pptx等等
$allowExt=array(&#39;jpeg&#39;,&#39;jpg&#39;,&#39;png&#39;,&#39;gif&#39;,&#39;html&#39;,&#39;txt&#39;);
foreach($files as $fileInfo){
    //修改上传保存的文件夹为本地的&#39;imooc&#39;，如果没有这个文件夹，那么就创建一个
    //&#39;false&#39;参数:不要检查上传的文件是否为真实的图片，因为要允许上传除开图片类型外的其他类型文件，如html、txt
    $res=uploadFile($fileInfo,&#39;imooc&#39;,false,$allowExt);
    echo $res[&#39;mes&#39;],&#39;<br/>&#39;;
    $uploadFiles[]=$res[&#39;dest&#39;];//如果要不显示错误信息的话，用@$uploadFiles[]=$res[&#39;dest&#39;];
}
$uploadFiles=array_values(array_filter($uploadFiles));//这样便于保存到数据库
print_r($uploadFiles);//打印查看上传保存的结果
?>

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