How to check if mod_rewrite is enabled in php?

Question

I was wondering if it is possible to check if mod_rewrite is enabled on Apache AND IIS in PHP.

ModRewrite for IIS exists. Check it here.

So, I'm looking for a PHP script that checks for mod_rewrite on Apache and IIS.

Does anyone know such script or can write one?

Especially for Microsoft IIS.

Thanks!

score 127 · Accepted Answer · edited May 08 '15 at 07:58

127

If you're using mod_php, you can use apache_get_modules(). This will return an array of all enabled modules, so to check if mod_rewrite is enabled, you could simply do

in_array('mod_rewrite', apache_get_modules());

Unfortunately, you're most likely trying to do this with CGI, which makes it a little bit more difficult.

You can test it using the following, though

strpos(shell_exec('/usr/local/apache/bin/apachectl -l'), 'mod_rewrite') !== false

If the above condition evaluates to true, then mod_write is enabled.

edited May 08 '15 at 07:58

Deep Kakkar

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answered Jan 26 '12 at 16:30

kba

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I don't know. This tests for if the module `mod_rewrite` is installed. The _IIS Mod-Rewrite_ module you're probably referring to is an entirely different and commercial product - it has no association with the Apache module, it's an entirely different question and I have no experience using it. – kba Jan 26 '12 at 16:36
That's true, so there is properly no general script? – Ties Jan 26 '12 at 16:38
@DrCord Then I'm guessing you're using it in CGI. – kba Aug 07 '13 at 21:16
nope, was using it in a php script just like the answer and the answer below. if( ! function_exists('apache_get_modules') ){ phpinfo(); die; } always is true on my server... – DrCord Aug 07 '13 at 23:35
Your PHP script could very easily be CGI. – kba Aug 07 '13 at 23:45
@kba I dont know what path to pass in my shared server to shell_exec, I tried getting it through SHELL command but i dont have permissions for this and $_SERVER['path'] is not working at all. – Ravi Soni Aug 20 '13 at 05:05
Does this return true if the module is installed, or enabled? For me it's returning true as the module is installed, but disabled. – S.. Jun 30 '14 at 17:57
thanks, here is the full code: – Thorsten Staerk Nov 08 '14 at 16:27
Why not go with ``? It shows really important data, including Apache modules loaded – Jun 02 '15 at 02:30
2

@Gerep `phpinfo()` can be useful for many things, but if you want to write a system that uses `mod_rewrite` if it's enabled or otherwise fallbacks to some other behaviour, it be useful to detect it programmatically. – kba Jun 02 '15 at 02:41
tried `strpos(shell_exec('/usr/local/apache/bin/apachectl -l'), 'mod_rewrite') !== false` it give `-bash: syntax error near unexpected token `shell_exec'` – Kangarooo Oct 04 '15 at 21:45

score 96 · Answer 2 · edited Jun 20 '20 at 09:12

96

Copy this piece of code and run it to find out.

<?php
 if(!function_exists('apache_get_modules') ){ phpinfo(); exit; }
 $res = 'Module Unavailable';
 if(in_array('mod_rewrite',apache_get_modules())) 
 $res = 'Module Available';
?>
<html>
<head>
<title>A mod_rewrite availability check !</title></head>
<body>
<p><?php echo apache_get_version(),"</p><p>mod_rewrite $res"; ?></p>
</body>
</html>

edited Jun 20 '20 at 09:12

Community

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answered Jan 26 '12 at 16:28

Shankar Narayana Damodaran

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Will phpinfo also tell me if I don't have mod_php enabled? – Owen McAlack Aug 01 '13 at 05:06
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yes we can see in phpinfo.php all Apche's "Loaded Modules" – Mohini Jul 23 '15 at 12:38

score 54 · Answer 3 · edited Dec 26 '14 at 04:03

54

I like Christian Roy's solution:

###  .htaccess

<IfModule mod_rewrite.c>

    # Tell PHP that the mod_rewrite module is ENABLED.
    SetEnv HTTP_MOD_REWRITE On

    RewriteEngine on
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    # The rest of your rewrite rules here

</IfModule>

Then, you can check in your PHP code for

    array_key_exists('HTTP_MOD_REWRITE', $_SERVER);

No idea if this works also with IIS (I have no way to check) but the odds are good.

edited Dec 26 '14 at 04:03

William Entriken

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answered Jan 17 '13 at 09:20

a.l.e

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With a `` it would be almost perfect. :) – RibeiroBreno Feb 02 '14 at 01:17
This is a very useful and simple solution and it works even if PHP is running as CGI – Jose B Apr 27 '15 at 20:12
as @RibeiroBreno mentioned, with it would be almost perfect. this worked for me perfectly. – Kassem Jun 18 '15 at 08:09
If PHP is running as CGI, this is the way to go. Works beautifully. – Wojciech Jakubas Dec 05 '15 at 23:26
Thank you! @a.l.e – Даниил Feb 24 '21 at 17:55
I like this idea. Another advantage : this will indirectly also check if the .htaccess was taken into account. – Yosko Nov 21 '22 at 14:41

score 35 · Answer 4 · answered Jan 12 '13 at 15:49

35

Upload a file called info.php with this code and run it:

<?php 
phpinfo();

Search for mod_rewrite on the page, and see if you can find it under Loaded Modules.

answered Jan 12 '13 at 15:49

Johnny Jensen

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score 28 · Answer 5 · edited Mar 07 '17 at 10:47

28

don't make it so difficult you can simply find in phpinfo();

enter image description here

Hope helpful!

Thanks

edited Mar 07 '17 at 10:47

Muhammad Hassaan

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answered Mar 05 '15 at 15:47

loyola

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This was the quickest and simplest route for me, since I was already doing stuff with a phpinfo call/file. Thanks! :) – Brian U Jan 29 '16 at 16:21
@loyola , I can't update my comment, so I deleted, thank – vanduc1102 Jul 19 '16 at 03:52

score 11 · Answer 6 · answered Aug 24 '14 at 02:15

11

via command line we in centOs we can do this

httpd -l

answered Aug 24 '14 at 02:15

h0mayun

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And if you are on ubuntu: apache2 -l – youanden Oct 04 '14 at 19:42
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Or **apachectl -M** in Ubuntu as well – Batandwa Dec 15 '15 at 04:34
This seems to show only modules that were compiled in. – jayarjo May 18 '17 at 09:35
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__httpd -M__ shows list of loaded Static and Shared modules. – jayarjo May 18 '17 at 09:36

user1649798 · Answer 7 · 2013-04-14T15:40:27.677

7

<?php
phpinfo();
?>

Look under Configuration in the apache2handler in the Loaded Modules row.

This is simple and works.

<?php foreach( apache_get_modules() as $module ) echo "$module<br />";  ?>

edited Apr 14 '13 at 15:40

answered Apr 14 '13 at 14:59

user1649798

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score 7 · Answer 8 · answered Jan 21 '14 at 05:19

This is my current method of checking if Mod_rewrite enabled for both Apache and IIS

/**
 * --------------------------------------------------------------
 *  MOD REWRITE CHECK
 * --------------------------------------------------------------
 *                                        - By A H Abid
 * Define Constant for MOD REWRITE
 * 
 * Check if server allows MOD REWRITE. Checks for both 
 * Apache and IIS.
 * 
 */
if( function_exists('apache_get_modules') && in_array('mod_rewrite',apache_get_modules()) )
    $mod_rewrite = TRUE;
elseif( isset($_SERVER['IIS_UrlRewriteModule']) )
    $mod_rewrite = TRUE;
else
    $mod_rewrite = FALSE;
define('MOD_REWRITE', $mod_rewrite);

It works in my local machine and also worked in my IIS based webhost. However, on a particular apache server, it didn't worked for Apache as the apache_get_modules() was disabled but the mod_rewrite was enable in that server.

score 3 · Answer 9 · edited Mar 11 '14 at 01:23

3

Two lines of code:

$isEnabled = in_array('mod_rewrite', apache_get_modules());
echo ($isEnabled) ? 'Enabled' : 'Not enabled';

edited Mar 11 '14 at 01:23

Dan Rosenstark

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answered Oct 06 '13 at 11:53

Amal Murali

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score 3 · Answer 10 · edited Aug 13 '12 at 14:23

3

You can get a list of installed apache modules, and check against that. Perhaps you can check if its installed by searching for its .dll (or linux equivalent) file.

edited Aug 13 '12 at 14:23

tolgamorf

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answered Jan 26 '12 at 16:27

TJHeuvel

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@kba How to check for then in CGI mode. – Ravi Soni Aug 19 '13 at 08:30

score 1 · Answer 11 · answered Sep 03 '14 at 21:28

1

Another idea, indeed more a dirty hack, regarding mod rewrite is server dependend an not necessary a php issue: Why not, if you have the possibillity, create a test directory put a .htaccess in it rewriting to test.php, call the directory via http and check if you get the expected result you put in test.php.

Indeed, dirty.

answered Sep 03 '14 at 21:28

webfan

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I created a library that builds on this exact idea: https://github.com/rosell-dk/htaccess-capability-tester – rosell.dk Sep 24 '20 at 07:54

score 1 · Answer 12 · answered Mar 27 '17 at 11:26

1

One more method through exec().

exec('/usr/bin/httpd -M | find "rewrite_module"',$output);

If mod_rewrite is loaded it will return "rewrite_module" in output.

answered Mar 27 '17 at 11:26

Abhishek Gurjar

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score 0 · Answer 13 · answered Feb 25 '19 at 12:40

0

Use this function:

function apache_module_exists($module)
{
    return in_array($module, apache_get_modules());
}

answered Feb 25 '19 at 12:40

Black

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score 0 · Answer 14 · answered May 09 '20 at 18:39

0

For IIS heros and heroins:

No need to look for mod_rewrite. Just install Rewrite 2 module and then import .htaccess files.

answered May 09 '20 at 18:39

Shadi Alnamrouti

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score 0 · Answer 15 · answered Sep 24 '20 at 08:12

Actually, just because a module is loaded, it does not necessarily mean that the directives has been enabled in the directory you are placing the .htaccess. What you probably need is to know: Does rewriting work? The only way to find out for sure is to do an actual test: Put some test files on the server and request it with HTTP.

Good news: I created a library for doing exactly this (detecting various .htaccess capabilities). With this library, all you need to do is this:

require 'vendor/autoload.php';
use HtaccessCapabilityTester\HtaccessCapabilityTester;

$hct = new HtaccessCapabilityTester($baseDir, $baseUrl);
if ($hct->rewriteWorks()) {    
    // rewriting works
}

(instead of $baseDir and $baseUrl, you must provide the path to where the test files are going to be put and a corresponding URL to where they can be reached)

If you just want to know if the module is loaded, you can do the following:

if ($hct->moduleLoaded('rewrite')) {    
    // mod_rewrite is loaded (tested in a real .htaccess by using the "IfModule" directive)
}

The library is available here: https://github.com/rosell-dk/htaccess-capability-tester

How to check if mod_rewrite is enabled in php?

15 Answers15

Copy this piece of code and run it to find out.

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