How to get the file extension in PHP _ PHP Tutorial

PHP to obtain the file extension. PHP methods for obtaining file extensions there are many methods. the following three methods are provided. you can study them. I will not explain them in detail, how to obtain the file extension directly from PHP

There are many methods for PHP to get the file extension. the following three methods are provided. you can study these methods without explaining them and give the final correct answer.

Echo pathinfo ('/www/htdocs/your_image.jpg', PATHINFO_EXTENSION );
Incorrect syntax:
You may write

Function get_file_extension ($ file_name ){
Return substr (strrchr ($ file_name, '.'), 1 );
}
Or write it like this

Function file_extension ($ filename ){
Return end (explode (".", $ filename ));
}
What does pathinfo do?

$ File_path = pathinfo ('/www/htdocs/your_image.jpg ');

Echo "$ file_path ['dirname'] n ";
Echo "$ file_path ['basename'] n ";
Echo "$ file_path ['extension'] n ";
Echo "$ file_path ['filename'] n"; // only in PHP 5.2 +
?>
The above output

/Www/htdocs
Your_image.jpg
Jpg
Your_image

The code is as follows:
// Method 1
Function extend_1 ($ file_name)
{
$ Retval = "";
$ Pt = strrpos ($ file_name ,".");
If ($ pt) $ retval = substr ($ file_name, $ pt + 1, strlen ($ file_name)-$ pt );
Return ($ retval );
}
// Method 2
Function extend_2 ($ file_name)
{
$ Extend = pathinfo ($ file_name );
$ Extend = strtolower ($ extend ["extension"]);
Return $ extend;
}
// Method 3
Function extend_3 ($ file_name)
{
$ Extend = explode (".", $ file_name );
$ Va = count ($ extend)-1;
Return $ extend [$ va];
}
?>

Http://www.bkjia.com/PHPjc/632277.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/632277.htmlTechArticlePHP get file extension method PHP get file extension there are many ways, the following provides three methods, you can study, the specific will not explain, directly to the final positive...