How to use php to obtain the filename suffix _ PHP Tutorial

How to get the filename suffix in php. Php Method 1: Copy the code as follows :? Phpfunctionextend_1 ($ file_name) {$ retval ""; $ ptstrrpos ($ file_name, "."); php obtains the file suffix (format file)

// Method 1:

The code is as follows:

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

The code is as follows:

Function extend_2 ($ file_name)
{
$ Extend = pathinfo ($ file_name );
$ Extend = strtolower ($ extend ["extension"]);
Return $ extend;
}

// Method 3

The code is as follows:

Function extend_3 ($ file_name)
{
$ Extend = explode (".", $ file_name );
$ Va = count ($ extend)-1;
Return $ extend [$ va];
}

// Method 4

The code is as follows:

Function getFileExt ($ file_name)
{
While ($ dot = strpos ($ file_name, ".")
{
$ File_name = substr ($ file_name, $ dot + 1 );
}
Return $ file_name;
}
?>

In addition:
PHP pathinfo () function
PHP Filesystem function
Definition and usage
The pathinfo () function returns the file path information in an array.
Syntax
Pathinfo (path, options)
Parameters
Description
Path
Required. Specifies the path to be checked.
Process_sections
Optional. Specifies the array element to be returned. The default value is all.
Possible values:
PATHINFO_DIRNAME-returns only dirname
PATHINFO_BASENAME-only return basename
PATHINFO_EXTENSION-returns only extension
Description
Pathinfo () returns an associated array containing path information.
Includes the following array elements:
[Dirname]
[Basename]
[Extension]
Tips and comments
Note:If not all units are required, the pathinfo () function returns a string.
Example
Example 1

The code is as follows:

// Output:
// Array ([dirname] =>/testweb [basename] => test.txt [extension] => txt)

Example 2

The code is as follows:

// Output:
// Test.txt

Parse (format file) // Method 1: The code is as follows :? Php function extend_1 ($ file_name) {$ retval = ""; $ pt = strrpos ($ file_name, ".");...