CODEWITHSUNDEEP
php
Jack Maessen
Jack Maessen

Reputation: 1864

how to grab part of a url string with php

I am using a filemangement system and to protect the url. Manipulation of the url string is not allowed and leads to killing the page. I want to make an exception for that when I delete files.

When deleting files, the url string always looks like this:

example.com/sfm?delete=uploads/sfm/c4ca4238a0b923820dcc509a6f75849b/folder1

or 

example.com/sfm?delete=uploads/sfm/c4ca4238a0b923820dcc509a6f75849b/file.jpg

or

example.com/sfm?delete=uploads/sfm/c4ca4238a0b923820dcc509a6f75849b/folder1/file.jpg

So the minimum of the string contains always:

example.com/sfm?delete=uploads/sfm/c4ca4238a0b923820dcc509a6f75849b

( the hash is a md5 hash of a userid)

So how can I grab that minimum url string?

Upvotes: 0

Views: 40

Answers (2)

Murad Hasan
Murad Hasan

Reputation: 9583

Use implode, array_slice, explode.

Explode will extract the string to array, array slice cut the array upto 4th item, and implode will grab the array items to a new string.

$str = 'example.com/sfm?delete=uploads/sfm/c4ca4238a0b923820dcc509a6f75849b/folder1 ';

echo $output = implode('/', array_slice(explode("/", $str), 0, 4)); //example.com/sfm?delete=uploads/sfm/c4ca4238a0b923820dcc509a6f75849b

Upvotes: 1

Praveen Kumar Purushothaman
Praveen Kumar Purushothaman

Reputation: 167162

I would just use explode(). Even if the hash is not of the same size, if you follow the same structure, I would just do this:

$delete = explode("/", $_GET["delete"]);
print_r($delete);

Outputs to:

Array
(
    [0] => uploads
    [1] => sfm
    [2] => c4ca4238a0b923820dcc509a6f75849b
    [3] => folder1
)

The $delete[2] will give me the hash. I guess this would be the best way, even if the URL changes.

Upvotes: 1

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