Php-PHP source code

When uploading PHP files, we all need to use the file type identification function. Below I will introduce several common examples of file type identification. When uploading PHP files, we all need to use the file type identification function. Below I will introduce several common examples of file type identification.

Script ec (2); script

The following describes how to determine the image format in php:

The first method is to treat the image path as a string, so the image format is changed to a string for searching for a. Number.

The Code is as follows:
$ File = "test.jpg "; $ Filetype = strtolower (strrchr ($ file ,".")); $ Arrtype = array (". jpeg", ". bmp", ". gif", ". jpg "); If (! In_array ($ filetype, $ arrtype )) { Echo 'invalid format '; Exit; }

Getimagesize is used to obtain the image size format. This is not a function of the gd class library. This method is very classic. It can be used to determine the image format and obtain the image length and width.

An example is as follows:

The Code is as follows:
$ Array = getimagesize ("images/flower_1.jpg "); Print_r ($ array );

The return value of this function is an array with the following content:

The Code is as follows:
Array ( [0] = & gt; 350 [1] => 318. [2] => 2 [3] => width = "350" height = "318 ″ [Bits] => 8 [Channels] => 3 [Mime] => image/jpeg )