我尝试过这样的方法：
$string = "localhost/product/-/123456-Ebook-Guitar";
echo $string = substr($string, 0, strpos(strrev($string), "-/(0-9+)")-13);
输出功：
localhost/product/-/123456 cause this just for above link with 13 character after /-/123456
如何删除所有？我试试
$string = "localhost/product/-/123456-Ebook-Guitar";
echo $string = substr($string, 0, strpos(strrev($string), "-/(0-9+)")-(.*));
不工作，犯错误。
我试试
$string = "localhost/product/-/123456-Ebook-Guitar";
echo $string = substr($string, 0, strpos(strrev($string), "-/(0-9+)")-999);
输出为空。。
假设localhost/product/-/123456之后没有数字，那么我就用下面的来修剪它
$string = "localhost/product/-/123456-Ebook-Guitar";
echo rtrim($string, "a..zA..Z-"); // localhost/product/-/123456
另一个非正则表达式版本，但需要5.3.0+
$str = "localhost/product/-/123456-Ebook-Guitar-1-pdf/";
echo dirname($str) . "/" . strstr(basename($str), "-", true); //localhost/product/-/123456
这是一种更灵活的方式，但涉及正则表达式
$string = "localhost/product/-/123456-Ebook-Guitar";
echo preg_replace("/^([^?]*-'/'d+)([^?]*)/", "$1", $string);
// localhost/product/-/123456
$string = "localhost/product/-/123456-Ebook-Guitar-1-pdf/";
echo preg_replace("/^([^?]*-'/'d+)([^?]*)/", "$1", $string);
// localhost/product/-/123456
这应该匹配捕获数字之前的所有内容，并在之后删除所有内容
regex101:localhost/product/-/123456电子书吉他
regex101:localhost/product/-/123456-Ebok-Guitar-1-pdf/
不是一行，但这会起作用：
$string = "localhost/product/-/123456-Ebook-Guitar";
// explode by "/"
$array1 = explode('/', $string);
// take the last element
$last = array_pop($array1);
// explode by "-"
$array2 = explode('-', $last);
// and finally, concatenate only what we want
$result = implode('/', $array1) . '/' . $array2[0];
// $result ---> "localhost/product/-/123456"