How to add .htaccess code through a function?

I need to add the following .htaccess code through a function

    <IfModule mod_deflate.c>
# Insert filters
AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript
AddOutputFilterByType DEFLATE application/x-httpd-php
AddOutputFilterByType DEFLATE application/x-httpd-fastphp
AddOutputFilterByType DEFLATE image/svg+xml

# Drop problematic browsers
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4.0[678] no-gzip
BrowserMatch bMSI[E] !no-gzip !gzip-only-text/html

# Make sure proxies don't deliver the wrong content
Header append Vary User-Agent env=!dont-vary
</IfModule>

## Expires Caching ##

<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/jpg "access 2 week"
ExpiresByType image/jpeg "access 2 week"
ExpiresByType image/gif "access 2 week"
ExpiresByType image/png "access 2 week"
ExpiresByType text/css "access 2 week"
ExpiresByType application/pdf "access 2 week"
ExpiresByType text/x-javascript "access 2 week"
ExpiresByType application/x-shockwave-flash "access 2 week"
ExpiresByType image/x-icon "access 2 week"
ExpiresDefault "access 2 week"
</IfModule>

## Expires Caching ##

In my themes function.php

function add_htaccess
{
//the above code to add
}

I just don’t want to add it manually.

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Answers:

Method 1

Method 2

Method 3

Answers:

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Method 1

/**
 * Inserts an array of strings into a file (.htaccess ), placing it between
 * BEGIN and END markers. Replaces existing marked info. Retains surrounding
 * data. Creates file if none exists.
 *
 * @param array|string $insertion
 * @return bool True on write success, false on failure.
 */
function add_htaccess($insertion)
{
    $htaccess_file = ABSPATH.'.htaccess';
    return insert_with_markers($htaccess_file, 'MyMarker', (array) $insertion);
}

Notes:

$insertion is an array of strings. Each string gets a new line in the file.
You should, of course, replace ‘MyMarker’ with your own name. Your content will be inserted in this specified container, leaving the rest of the file alone.
This function relies on the insert_with_markers() function which is only loaded in the admin area. You will have to load wp-admin/includes/misc.php manually otherwise.
The .htaccess has to be writable in order for this function to work.

Method 2

Just a quick tip – you should get a basic idea by looking on how it’s done in WordPress core:

The source of save_mod_rewrite_rules() and insert_with_markers() functions might be interesting for you.

You will see the rules are written to the file with PHP fwrite().
The code that checks for the .htaccess file itself being present, writable etc. will be useful as well.

Get insipired.

PS: There may be filters to make the job easier but learning the methods behind is a good idea anyway ,)

Method 3

The action is generate_rewrite_rules.

Check these questions you may find them useful:

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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