![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
天蓬老师Correction status：qualified
Teacher's comments：文件上传需要前后端的配合, 其实原理是很简单的, 涉及到的函数并不多
Collection
Collection
<?php// printf("<pre>%s</pre>",print_r($_FILES,true));class upException extends Exception{public function __toString(){return '错误信息：'.$this->message.';错误代码：'.$this->code;}}try{// echo $type;// echo $name,$type,$tmp_name,$error,$size;switch($error){case UPLOAD_ERR_OK:// var_dump(trim(strstr($type,'/'),'/'));// var_dump(trim(strstr($type,'/',true),'/')!=='jpeg');$ty=trim(strstr($type,'/'),'/');if($ty==='jpeg'){if(file_exists($tmp_name)&&is_uploaded_file($tmp_name)){$obj_type=$ty;$obj_file='images/'.time().'.'.$obj_type;move_uploaded_file($tmp_name,$obj_file);}exit("<script>alert('上传成功');location.href='demo1.php'</script>");}else{exit("<script>alert('格式不正确，请重新上传!');location.href='demo1.php'</script>");}break;case UPLOAD_ERR_INI_SIZE:throw new upException('文夹过大，超过php限制',1);break;case UPLOAD_ERR_FORM_SIZE:throw new upException('文件过大，超过表单限制',2);break;case UPLOAD_ERR_PARTIAL:throw new upException('上传文件不完整',4);break;case UPLOAD_ERR_NO_FILE:throw new upException('没有文夹上传',5);break;case UPLOAD_ERR_NO_TMP_DIR:throw new upException('无临时目录',6);break;case UPLOAD_ERR_CANT_WRITE:throw new upException('权限不够，文件写入失败',7);break;default:echo "未知错误";}}catch(upException $e){echo $e;}
<?php// printf("<pre>%s</pre>",print_r($_FILES,true));class upException extends Exception{public function __toString(){return '错误信息：'.$this->message.';错误代码：'.$this->code;}}foreach($_FILES as $file){extract($file);// echo $name;try{// echo $type;// echo $name,$type,$tmp_name,$error,$size;switch($error){case UPLOAD_ERR_OK:// var_dump(trim(strstr($type,'/'),'/'));// var_dump(trim(strstr($type,'/',true),'/')!=='jpeg');$ty=trim(strstr($type,'/'),'/');if($ty==='jpeg'){if(file_exists($tmp_name)&&is_uploaded_file($tmp_name)){$obj_type=$ty;$obj_file='images/'.trim($name,'.jpg').time().'.'.$obj_type;// echo $obj_file,'<br>';move_uploaded_file($tmp_name,$obj_file);}}else{echo ("<script>alert('格式不正确，请重新上传!');location.href='demo2.php'</script>");}break;case UPLOAD_ERR_INI_SIZE:throw new upException("{$name}文夹过大，超过php限制",1);break;case UPLOAD_ERR_FORM_SIZE:throw new upException("{$name}文件过大，超过表单限制",2);break;case UPLOAD_ERR_PARTIAL:throw new upException("{$name}上传文件不完整",4);break;case UPLOAD_ERR_NO_FILE:throw new upException("{$name}没有文夹上传",5);break;case UPLOAD_ERR_NO_TMP_DIR:throw new upException("{$name}无临时目录",6);break;case UPLOAD_ERR_CANT_WRITE:throw new upException("{$name}权限不够，文件写入失败",7);break;default:echo "未知错误";}// exit("<script>alert('上传成功');location.href='demo2.php'</script>");}catch(upException $e){echo ("<script>alert('{$e}');</script>");}}exit("<script>alert('上传完毕！');location.href='demo2.php'</script>");
<?php// printf("<pre>%s</pre>",print_r($_FILES,true));// die();class upException extends Exception{public function __toString(){return '错误信息：'.$this->message.';错误代码：'.$this->code;}}$files=$_FILES['my_file'];foreach($files['error'] as $key=>$value){try{switch($value){case UPLOAD_ERR_OK:// var_dump(trim(strstr($type,'/'),'/'));// var_dump(trim(strstr($type,'/',true),'/')!=='jpeg');$ty=trim(strstr($files['type'][$key],'/'),'/');if($ty==='jpeg'){if(file_exists($files['tmp_name'][$key])&&is_uploaded_file($files['tmp_name'][$key])){$obj_type=$ty;$obj_file='images/'.trim($files['name'][$key],'.jpg').time().'.'.$obj_type;// echo $obj_file,'<br>';move_uploaded_file($files['tmp_name'][$key],$obj_file);}}else{echo ("<script>alert('{$files['name'][$key]}格式不正确，请重新上传!');</script>");}break;case UPLOAD_ERR_INI_SIZE:throw new upException("{$files['name'][$key]}文夹过大，超过php限制",1);break;case UPLOAD_ERR_FORM_SIZE:throw new upException("{$files['name'][$key]}文件过大，超过表单限制",2);break;case UPLOAD_ERR_PARTIAL:throw new upException("{$files['name'][$key]}上传文件不完整",4);break;case UPLOAD_ERR_NO_FILE:throw new upException("{$files['name'][$key]}没有文夹上传",5);break;case UPLOAD_ERR_NO_TMP_DIR:throw new upException("{$files['name'][$key]}无临时目录",6);break;case UPLOAD_ERR_CANT_WRITE:throw new upException("{$files['name'][$key]}权限不够，文件写入失败",7);break;default:echo "未知错误";}}catch (upException $e){echo ("<script>alert('{$e}');</script>");}}exit("<script>alert('上传完毕！');location.href='demo3.php'</script>");
1、上传文件信息关键字:$_FILES(name、type、tmp_name、error、size);
2、把上传文夹从临时目录移动过到目标目录：move_uploaded_file('tmp_name','目标文夹目录')；
3、is_uploaded_file();判断上传文件的合法性
4、文件前端以表单的形式上传：
<form action="act3.php" method="POST" enctype="multipart/form-data">//文件上传，上传方式：post,上传编码：multipart/form-data<fieldset><legend>文件上传</legend>//隐藏域，用来限制上传文件大小<input type="hidden" name="MAX_FILE_SIZE" value="10000000">//上传文件：multiple：多选<input type="file" name="my_file[]" multiple><button>上传</button></fieldset></form>
5、在上传文件时：需查看设置php.ini中：file_uploads、upload_tmp_dir、max_file_uploads、post_max_size、upload_max_filesize等相关设置
6、php常用函数：strstr($str,'分割字符'，true|flase)：分割字符trim($str,'去掉的字符')：去掉字符两端的不需要的字符
file_exists($file);检测文件试问存在
7、script函数:alert('提示内容'):单传提示函数；location.href='';自动跳转至……；
天蓬老师