php判断文件上传图片格式的实例详解
判断文件图片类型,
$type = $_FILES['image']['tmp_name'];//文件名 //$type = $this->getImagetype( $type ); $filetype = ['jpg', 'jpeg', 'gif', 'bmp', 'png']; if (! in_array($type, $filetype)) { return "不是图片类型"; ｝
如上如果用户修改文件后缀为png jpeg等无法满足,查了查资料解决方法是采用判断文件的二进制流信息,如果你刚好遇到这种问题不妨尝试一下：
//*判断图片上传格式是否为图片 return返回文件后缀 public function getImagetype($filename) { $file = fopen($filename, 'rb'); $bin = fread($file, 2); //只读2字节 fclose($file); $strInfo = @unpack('C2chars', $bin); $typeCode = intval($strInfo['chars1'].$strInfo['chars2']); // dd($typeCode); $fileType = ''; switch ($typeCode) { case 255216: $fileType = 'jpg'; break; case 7173: $fileType = 'gif'; break; case 6677: $fileType = 'bmp'; break; case 13780: $fileType = 'png'; break; default: $fileType = '只能上传图片类型格式'; } // if ($strInfo['chars1']=='-1' AND $strInfo['chars2']=='-40' ) return 'jpg'; // if ($strInfo['chars1']=='-119' AND $strInfo['chars2']=='80' ) return 'png'; return $fileType; }