need help to cut a string with PHP

I have a string:

$str = "http://www.abc.com/xxx/xxx/v54/c505/1.html";

How do I cut th开发者_运维问答e trailing 1.html off ?

The result I desire is http://www.abc.com/xxx/xxx/v54/c505/.

Use dirname()

$newStr = dirname($str) . '/';

$str = substr($str, 0, strrpos($str, '/') + 1);

CodePad.

You can use dirname() --

$str = "http://www.abc.com/xxx/xxx/v54/c505/1.html";
$dir = dirname($str);