yii2文件上传

$file=$_FILES['myfile'];
$uploads=new Uploads();
$res=$uploads->up($file);
$ress=ltrim($res,'.');
$gift_img="路径".$ress;
//添加入库
$re=\Yii::$app->db->createCommand()->insert('gift'[/b],[
'gift_img' =>$gift_img,
])->execute();

<div class="form-group"><label for="">礼物图片</label><input class="form-input-txt" type="file" name="myfile" onblur="my_file()" id="files"/><span id="s_file"></span></div>

放在yii/web/Uploads里面

<?phpnamespace yii\web;/*单个文件上传功能上传文件配置允许的后缀配置允许的大小获取文件后缀判断文件的后缀报错*/class Uploads{protected $allowExt = 'jpg,jpeg,gif,bmp,png';protected $maxSize = 10; //1M ，以M为单位protected $file = null; //准备储存上传文件信息protected $errno = 0; //错误代码protected $error = array(0=>'无错',1=>'上传文件大小超出系统限制',2=>'上传文件的大小超出网页表单限制',3=>'文件只有部分被上传',4=>'没有文件被上传',6=>'找不到临时文件夹',7=>'文件写入失败',8=>'不允许的文件后缀',9=>'文件大小超出类的允许范围',10=>'创建目录失败',11=>'文件移动失败');/*上传*/public function up($key) {if (!isset($key)) {return false;}$f = $key;//检验上传是否成功if ($f['error']) {$this->errno = <12d5f/span>$f['error'];return false;}//获取后缀$ext = $this->getExt($f['name']);//检查后缀if (!$this->isAllowExt($ext)) {$this->errno = 8;return false;}//检查大小if (!$this->isAllowSize($f['size'])) {$this->errno = 9;return false;}//创建目录$dir = $this->mk_dir();if ($dir == false) {$this->errno = 10;return fasle;}//生成随机文件名$newname = $this->randName() . '.' .$ext;//$dir = $dir . '/' .$newname;//移动if(!move_uploaded_file($f['tmp_name'], $dir . '/' .$newname)) {$this->errno = 11;return false;}else{return $dir.'/'.$newname;}return true;//str_replace(ROOT, '', $dir);}public function getErr(){return $this->error[$this->errno];}/*parm string $exts 允许的后缀自动添加 允许的后缀，和文件的大小*/public function setExt($exts) {$this->allowExt = $exts;}public function setSize($num) {$this->maxSize = $num;}/*string $filereturn string $ext 后缀*/protected function getExt($file) {$tmp = explode('.', $file);return end($tmp);}/*string $ext 文件后缀return bool防止大小写的问题*/protected function isAllowExt($ext) {return in_array(strtolower($ext), explode(',', strtolower($this->allowExt))) ;}/*检查文件的大小*/protected function isAllowSize($size) {return $size <= $this->maxSize *1024*1024;}//按日期创建目录的方法protected function mk_dir() {$dir = './images/' . date('Ym/d');if(is_dir($dir) || mkdir($dir,0777,true)) {return $dir;} else {return false;}}/*生成随机文件名*/protected function randName($length = 6) {$str = 'abcdefghijkmnpqrstuvwxyz23456789';return substr(str_shuffle($str),0,$length);}}