Laravel 8 dirname {#collection-method}

dirname 方法用于返回指定字符串的父级目录部分：

use Illuminate\Support\Str;

$string = Str::of('/foo/bar/baz')->dirname();

// '/foo/bar' 

您亦可指定您想要从字符串中删除多少个目录级别，该参数是可选的：

use Illuminate\Support\Str;

$string = Str::of('/foo/bar/baz')->dirname(2);

// '/foo'