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(PHP 5 >= 5.3.6)
SplFileInfo::getExtension — Gets the file extension
Retrieves the file extension.
此函数没有参数。
Returns a string containing the file extension, or an empty string if the file has no extension.
Example #1 SplFileInfo::getExtension() example
<?php
$info = new SplFileInfo ( 'foo.txt' );
var_dump ( $info -> getExtension ());
$info = new SplFileInfo ( 'photo.jpg' );
var_dump ( $info -> getExtension ());
$info = new SplFileInfo ( 'something.tar.gz' );
var_dump ( $info -> getExtension ());
?>
以上例程会输出:
string(3) "txt" string(3) "jpg" string(2) "gz"
Note:
This method is only available as of PHP 5.3.6. Another way of getting the extension is to use the pathinfo() function.
<?php
$extension = pathinfo ( $info -> getFilename (), PATHINFO_EXTENSION );
?>