Detailed Explanation of Example of php Judgment File Upload Picture Format

Detailed Explanation of Example of php Judgment File Upload Picture Format

Judge 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 ";
  } 

As above, if the user modifies the file suffix png jpeg, etc., the solution to check the data is to use the binary flow information of the judgment file. If you happen to encounter this problem, try 1:

 //* Judge whether the upload format of the picture is a picture or not  return Returns the 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:
    $fileType = ' You can only upload picture type formats ';
  }
  // if ($strInfo['chars1']=='-1' AND $strInfo['chars2']=='-40' ) return 'jpg';
  // if ($strInfo['chars1']=='-119' AND $strInfo['chars2']=='80' ) return 'png';
  return $fileType;
 }

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