PHP to determine the file upload image Format method introduction

This article mainly introduces the PHP judgment file upload image format of the relevant information, hope that through this article can help you to achieve such a method, very reference value, the need for friends can refer to the next

PHP to determine the file upload image format examples of detailed

Determine the file picture type,

$type  = $_files[' image ' [' tmp_name '];//filename//$type  = $this->getimagetype ($type);  $filetype = [' jpg ', ' jpeg ', ' gif ', ' BMP ', ' PNG ']; if (! In_array ($type, $filetype)) {   return ' is not a picture type ';}

If the user modifies the file suffix to png jpeg, etc. can not be satisfied, check the data to solve the problem is to use the binary flow information to determine the file, if you happen to encounter such problems may wish to try:

//* determine whether the image Upload format is a return file suffix public function getimagetype ($filename) {$file =  fopen ($filename, ' RB '); $bin = Fread ($file, 2);  Read-only 2-byte 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: $fileType = ' upload only image Type format ';  }//if ($strInfo [' chars1 ']== '-1 ' and $strInfo [' chars2 ']== ' -40 ') return ' jpg ';  if ($strInfo [' chars1 ']== ' -119 ' and $strInfo [' chars2 ']== ') return ' PNG '; return $fileType; }