Removing content from start and end of string (PHP) - php

Question

I'm trying to get a users ID from a string such as:
http://www.abcxyz.com/123456789/
To appear as 123456789 essentially stripping the info up to the first / and also removing the end /. I did have a look around on the net but there seems to be so many solutions but nothing answering both start and end.
Thanks :)
Update 1
The link can take two forms: mod_rewrite as above and also "http://www.abcxyz.com/profile?user_id=123456789"

Answer 1

I would use parse_url() to cleanly extract the path component from the URL:
$path = parse_URL("http://www.example.com/123456789/", PHP_URL_PATH);
and then split the path into its elements using explode():
$path = trim($path, "/"); // Remove starting and trailing slashes
$path_exploded = explode("/", $path);
and then output the first component of the path:
echo $path_exploded[0]; // Will output 123456789
this method will work in edge cases like
http://www.example.com/123456789?test
http://www.example.com//123456789
www.example.com/123456789/abcdef
and even
/123456789/abcdef

Answer 2

$string = 'http://www.abcxyz.com/123456789/';
$parts = array_filter(explode('/', $string));
$id = array_pop($parts);

Answer 3

If the ID always is the last member of the URL
$url="http://www.abcxyz.com/123456789/";
$id=preg_replace(",.*/([0-9]+)/$,","\\1",$url);
echo $id;

Answer 4

If there is no other numbers in the URL, you can also do
echo filter_var('http://www.abcxyz.com/123456789/', FILTER_SANITIZE_NUMBER_INT);
to strip out everything that is not a digit.
That might be somewhat quicker than using the parse_url+parse_str combination.

Answer 5

If your domain does not contain any numbers, you can handle both situations (with or without user_id) using:
<?php
$string1 = 'http://www.abcxyz.com/123456789/';
$string2 = 'http://www.abcxyz.com/profile?user_id=123456789';
preg_match('/[0-9]+/',$string1,$matches);
print_r($matches[0]);
preg_match('/[0-9]+/',$string2,$matches);
print_r($matches[0]);
?>