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PHP method to determine image type by obtaining header information
- 怪我咯Original
- 2017-07-07 10:06:401995browse
This article mainly introduces the method for PHP to determine the type of image by obtaining header information, involving PHP's related operating skills for image files. Friends in need can refer to the example of
Describes how PHP determines the image type by obtaining header information. Share it with everyone for your reference. The specific implementation method is as follows:
$filename = '617.gif' ;
function pictype ( $file )
{
/*$png_header = "/x89/x50/x4e/x47/x0d/x0a/x1a/x0a";
$jpg_header = "/xff/xd8";*/
$header = file_get_contents ( $file , 0 , NULL , 0 , 5 );
//echo bin2hex($header);
if ( $header { 0 }. $header { 1 }== "/x89/x50" )
{
return 'png' ;
}
else if( $header { 0 }. $header { 1 } == "/xff/xd8" )
{
return 'jpeg' ;
}
else if( $header { 0 }. $header { 1 }. $header { 2 } == "/x47/x49/x46" )
{
if( $header { 4 } == "/x37" )
return 'gif87' ;
else if( $header { 4 } == "/x39" )
return 'gif89' ;
}
}
echo pictype ( $filename );The above is the detailed content of PHP method to determine image type by obtaining header information. For more information, please follow other related articles on the PHP Chinese website!
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