php之封装上传文件函数 -

代码块

html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<form action="upload.php" method="post" enctype="multipart/form-data">
    <fieldset>
      <legend>单文件上传</legend>
      <label for="my_file"></label>
      <input type="file" name="my_file" id="my_file">
        <button type="submit">上传</button>
    </fieldset>
</form>
</body>
</html>

php

<?php
//printf('<pre>%s</pre>',print_r($_FILES,true));
$file =$_FILES;
a($file);
function a($file){
    ini_set('error.log','./error.log');
    $error = $file['my_file']['error'];
    if ($error!=0) {
        switch ($error) {
            case   1:
                exit('上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值');
            case 2:
                exit('上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值');
            case 3:
                exit('文件只有部分被上传');
            case 4:
                exit('没有文件被上传');
            case 5:
                exit('上传文件大小为0');
            default:
                exit('系统错误');
        }
    }
    $fileName = $file['my_file']['name'];
    $type = $file['my_file']['type'];
    $tmpName = $file['my_file']['tmp_name'];
    $size = $file['my_file']['size'];
    if ($size/1024/1024 > 5)   exit('文件大小不能超过5M');
    $type = explode('/',$type)[1];
    if (!in_array($type,['jpg','jpeg','png','wbmp','gif'] ))   exit('文件格式只能是jpg,jpeg,png,wbmp,gif');
    if (!file_exists('uploads/')) mkdir('uploads/',0777,true);
    move_uploaded_file($tmpName,"uploads/".$fileName);
    exit('文件上传成功');
}

效果图