How to get the filename suffix in php _php tutorial

PHP gets the file suffix name (format file)

//Method One:
Copy CodeThe 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 two
Copy CodeThe code is as follows:
function Extend_2 ($file _name)
{
$extend = PathInfo ($file _name);
$extend = Strtolower ($extend ["extension"]);
return $extend;
}

//Method Three
Copy CodeThe code is as follows:
function Extend_3 ($file _name)
{
$extend = Explode (".", $file _name);
$va = count ($extend)-1;
return $extend [$va];
}

//Method Four
Copy CodeThe 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 functions
Definition and usage
The PathInfo () function returns information about the file path in the form of an array.
Grammar
PathInfo (path,options)
parameters
Describe
Path
Necessary. Specifies the path to check.
Process_sections
Optional. Specifies the array element to return. The default is all.
Possible values:
pathinfo_dirname– only returns DIRNAME
pathinfo_basename– only returns BASENAME
pathinfo_extension– only returns EXTENSION
description
PathInfo () returns an associative array containing information about path.
Include the following array elements:
[DirName]
[BaseName]
[Extension]
Hints and notes
NOTES:If all cells are not required, the PathInfo () function returns a string.
Example
Example 1
Copy CodeThe code is as follows:

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

Example 2
Copy CodeThe code is as follows:

Output:
Test.txt

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