<a href='index.php?cat=".strtolower($name)."&article=".translitIt($value)."'>".$value."</a>

RewriteEngine On
RewriteRule ^([^/]*)/([^/]*)\.html$ /index.php?cat=$1&article=$2 [L]

http://mysite.loc/index.php?cat=php&article=obrabotka_formy

RewriteEngine On
RewriteRule ^([^/]*)/([^/]*)\$ /index.php?cat=$1&article=$2 [L]

	if (isset($_GET['cat']) and isset($_GET['article'])) 
	{
	
		echo $_GET['cat']. " ". $_GET['article'];
	
	}
	else
	{

		echo "<p><a href='/index.php?cat=".strtolower($name)."&article=".translitIt($value)."'>".$value."</a></p>";

	}

<a href="mysite.loc/$name/$article">$article</a>

RewriteEngine On
RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/]*)/([^/]*)$ index.php?cat=$1&article=$2 [L,QSA]

if (isset($_GET['cat']) and isset($_GET['article']))
{

	echo "categories with articles";

}
elseif (isset($_GET['cat']) and !isset($_GET['article']) or empty($_GET['article']))
{

	echo "it's Only categories";

}
else
{

	echo "main.page";

}

RewriteEngine On
RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/]*)/([^/]*)$ index.php?cat=$1&article=$2 [L,QSA]

RewriteRule ^([^/]*)$ index.php?cat=$1 [L]

<a href='php'>php</a>

RewriteRule ^cat/([0-9]+)$ index.php?cat=$1 [L]

elseif (isset($_GET['cat']) and !isset($_GET['article']))

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([a-zA-Z]*).html$ /?cat=$1 [L]
RewriteRule ^([a-zA-Z]*)/([a-zA-Z]*)\.html$ /?cat=$1&page=$2 [QSA,L]

RewriteRule ^([a-zA-Z]*)/([a-zA-Z]*)/([a-zA-z]*)\.html$ /?cat=$1&page=$2&art=$3 [QSA,L]