这是一个问题,你可以在网络上的任何地方看到各种答案:

$ext = end(explode('.', $filename));
$ext = substr(strrchr($filename, '.'), 1);
$ext = substr($filename, strrpos($filename, '.') + 1);
$ext = preg_replace('/^.*\.([^.]+)$/D', '$1', $filename);

$exts = split("[/\\.]", $filename);
$n    = count($exts)-1;
$ext  = $exts[$n];

etc.

然而,总是有“最好的方法”,它应该是堆栈溢出。


当前回答

很抱歉“简短的问题;但不是简短的回答”

PATH示例1

$path = "/home/ali/public_html/wp-content/themes/chicken/css/base.min.css";
$name = pathinfo($path, PATHINFO_FILENAME);
$ext  = pathinfo($path, PATHINFO_EXTENSION);
printf('<hr> Name: %s <br> Extension: %s', $name, $ext);

URL示例2

$url = "//www.example.com/dir/file.bak.php?Something+is+wrong=hello";
$url = parse_url($url);
$name = pathinfo($url['path'], PATHINFO_FILENAME);
$ext  = pathinfo($url['path'], PATHINFO_EXTENSION);
printf('<hr> Name: %s <br> Extension: %s', $name, $ext);

示例1的输出:

Name: base.min
Extension: css

示例2的输出:

Name: file.bak
Extension: php

工具书类

https://www.php.net/manual/en/function.pathinfo.phphttps://www.php.net/manual/en/function.realpath.phphttps://www.php.net/manual/en/function.parse-url.php

其他回答

ltrim(strstr($file_url, '.'), '.')

如果文件名像name.name.name.ext(丑陋,但有时会发生这种情况

只要它不包含路径,您也可以使用:

array_pop(explode('.', $fname))

其中$fname是文件的名称,例如:my_picture.jpg。结果将是:jpg

IMO,如果你有像name.name.name.ext这样的文件名(很难看,但有时会发生这种情况),这是最好的方法:

$ext     = explode('.', $filename); // Explode the string
$my_ext  = end($ext); // Get the last entry of the array

echo $my_ext;

您也可以尝试一下(它适用于PHP5.*和7):

$info = new SplFileInfo('test.zip');
echo $info->getExtension(); // ----- Output -----> zip

提示:如果文件没有扩展名,则返回空字符串

很抱歉“简短的问题;但不是简短的回答”

PATH示例1

$path = "/home/ali/public_html/wp-content/themes/chicken/css/base.min.css";
$name = pathinfo($path, PATHINFO_FILENAME);
$ext  = pathinfo($path, PATHINFO_EXTENSION);
printf('<hr> Name: %s <br> Extension: %s', $name, $ext);

URL示例2

$url = "//www.example.com/dir/file.bak.php?Something+is+wrong=hello";
$url = parse_url($url);
$name = pathinfo($url['path'], PATHINFO_FILENAME);
$ext  = pathinfo($url['path'], PATHINFO_EXTENSION);
printf('<hr> Name: %s <br> Extension: %s', $name, $ext);

示例1的输出:

Name: base.min
Extension: css

示例2的输出:

Name: file.bak
Extension: php

工具书类

https://www.php.net/manual/en/function.pathinfo.phphttps://www.php.net/manual/en/function.realpath.phphttps://www.php.net/manual/en/function.parse-url.php