PHP obtains the three functions with the file suffix.

PHP gets the file suffix. There are many ways to get the file extension. the following three methods are provided to get the file suffix. you can study it and the specific code will not be explained. Let's look at the code and select a method to remember. you can use it directly when you need it later, or you can click here to view this article.
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];
}
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