PHP: how to obtain the file extension _ PHP Tutorial-php Tutorial

How does PHP obtain the file extension. There are many ways to get the extension name of an object. Which of the following is an introduction .? Php?file_namebkjia.txt; echoget_exname ($ file_name); ***** there are many ways to get the file extension * @ paramunknown_ty there are many methods to get the file suffix. here is an introduction.

The strtolower () function converts a string to lowercase.

The strrev () function reverses the string.

The strpos () function returns the position where the string first appears in another string.

Find the position of the symbol '.' and calculate the length of the extension. Use the total length of the string minus the extension length to calculate the length to be truncated.

Bytes. ? Php $ file_name = "bkjia.txt"; echo get_exname ($ file_name);/*** get file extension * @ param unknown_ty...