Thanks, your function works great. However, it boggled my mind why it
didn't do the job in my website, then. After hacking away for like an
hour, it occured to me: the function should do more than just chopping
and comparing. Please consider:

$trail = array('products/veggies/winter', 'products/veggies',
'products');

$path_1 = 'products'; // true
$path_2 = 'products/423'; // false
$path_3 = 'products/veggies'; // true
$path_4 = 'products/meat'; // false
$path_5 = 'products/veggies/23'; // false
$path_6 = 'products/veggies/winter'; // true
$path_7 = 'products/veggies/winter/23/edit'; // true
$path_8 = 'products/meat/cow/dried/54/edit'; // false

The longest element in $trail is 'products/veggies/winter'. It has 3
parts (products, veggies and winter). I will call this element "A".

The function compares $path with $trail. if $path consists of 3 parts
or less, try finding a direct match. If there is a direct match,
return true. This is the case with $path_1, $path_3 and $path_6.
$path_2, $path_4 and $path_5 also have 3 or less parts, and there is
no direct match with $trail, so we return false.

If $path has more element-parts than A (in this case: 3), chop off the
extra parts and look if we now have a match. Two examples are $path_7
and $path_8:

- $path_7 has 5 parts, which is 2 more than A. We chop off "23/edit"
and compare "products/veggies/winter" to A, which will match and thus
return true
- $path_8 has 6 parts, which is 3 more than A. We chop off "dried/54/
edit" and compare "products/meat/cow" to A, which will return false

Could you please help me putting this into a function? I have no
trouble describing what should happen, but find it difficult
translating it into an efficient function.

Thanks in advance for any reply :-)