How to check a particular part of url using php

Question

I have a url in a variable.

<?php
$a='www.example.com';
?>

I have another variable, that has like this

<?php
$b='example.com';
?>

In what way I can check that $b and $a are same. I mean even if the url in $b is like

'example.com/test','example.com/test.html','www.example.com/example.html'

I need to check that $b is equal to $a in this case. If it is like example.net/example.org as the domain name changes, it should return false. I checked with strpos and strcmp. But I didn't find it is the correct way to check in case of urls.What function can I use to check that $b in this case is similar to $a?

You can ignore the domain part and only verify the path because your server is configured to receive incoming request for that particular domain. — karthikr
– karthikr, Commented Sep 28, 2013 at 14:51
I'm confused. Are you trying to compare the root domains in both $a and $b? — Amal
– Amal, Commented Sep 28, 2013 at 14:57
you need to use parse_rul: php.net/manual/en/function.parse-url.php — Mahdi
– Mahdi, Commented Sep 28, 2013 at 15:00
@AmalMurali You're right. I need to compare $b with $a. $a here is root domain. $b is url received — Ganesh Babu
– Ganesh Babu, Commented Sep 28, 2013 at 15:01

Community · Accepted Answer · 2017-05-23 11:56:35Z

1

You could use parse_url for parsing the URL and get the root domain, like so:

Add http:// to the URL if not already exists
Get the hostname part of the URL using PHP_URL_HOST constant
explode the URL by a dot (.)
Get the last two chunks of the array using array_slice
Implode the result array to get the root domain

A little function I made (which is a modified version of my own answer here):

function getRootDomain($url) 
{
    if (!preg_match("~^(?:f|ht)tps?://~i", $url)) {
        $url = "http://" . $url;
    }

    $domain = implode('.', array_slice(explode('.', parse_url($url, PHP_URL_HOST)), -2));
    return $domain;
}

Test cases:

$a = 'http://example.com';
$urls = array(
    'example.com/test',
    'example.com/test.html',
    'www.example.com/example.html',
    'example.net/foobar', 
    'example.org/bar'
    );

foreach ($urls as $url) {
    if(getRootDomain($url) == getRootDomain($a)) {
        echo "Root domain is the same\n";
    }
    else {
        echo "Not same\n";
    }
}

Output:

Root domain is the same
Root domain is the same
Root domain is the same
Not same
Not same

Note: This solution isn't foolproof and could fail for URLs like example.co.uk and you might want to additional checks to make sure that doesn't happen.

Demo!

edited May 23, 2017 at 11:56

CommunityBot

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answered Sep 28, 2013 at 15:06

Amal

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1 Comment

Ganesh Babu Over a year ago

As you said so, I am now stuck up with urls like example.co.uk. How further can we check in case of urls. Isn't there any restrictions for urls universally?

Bart Friederichs · Accepted Answer · 2013-09-28 14:59:01Z

1

You can use parse_url to do the heavy lifting and then split the hostname by the dot, checking if the last two elements are the same:

$url1 = parse_url($url1);
$url2 = parse_url($url2);

$host_parts1 = explode(".", $url1["host"]);
$host_parts2 = explode(".", $url2["host"]);

if ($host_parts1[count($host_parts1)-1] == $host_parts2[count($host_parts2)-1] &&
   ($host_parts1[count($host_parts1)-2] == $host_parts2[count($host_parts2)-2]) {
   echo "match";
} else {
   echo "no match";
}

answered Sep 28, 2013 at 14:59

Bart Friederichs

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Comments

Community · Accepted Answer · 2017-05-23 10:32:12Z

0

I think that this answer can help: Searching partial strings PHP

Since these URLs are just strings anyway

edited May 23, 2017 at 10:32

CommunityBot

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answered Sep 28, 2013 at 14:52

SMillerNL

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2 Comments

Amal Over a year ago

Read the question again. The OP is already aware or strpos().

SMillerNL Over a year ago

But the OP didn't think this was the correct way with URLs. But the URLs here are just strings. And therefore he can just as well use this.

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