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This is a snippet which extracts the Main Base Address from a complete URL:

<?php
function GetMainBaseFromURL($url)
{
$chars = preg_split('//', $url, -1, PREG_SPLIT_NO_EMPTY);

$slash = 3; // 3rd slash

$i = 0;

foreach($chars as $key => $char)
{
	if($char == '/')
	{
	   $j = $i++;
	}

	if($i == 3)
	{
	   $pos = $key; break;
	}
}

$main_base = substr($url, 0, $pos);

return $main_base.'/';
}

$url = 'http://mysubdomain.mydomain.com/category/hardware/subcategory/mainboards.html';

$main_base = GetMainBaseFromURL($url);

// Output: http://mysubdomain.mydomain.com/

echo $main_base;
?>

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