<?php
/*
* Class that abstracts URL;
* It can easily make URL's for dynamic scripts and also protects ur URL from "junk".
* With the word 'junk' i mean the situation when u add same variables with different values
* on the different parts of the scripts.
*
* Example of use:
* $action = new URL();
* $action->addVal("form_submitted","1");
* echo $action->Build();
* This will print ur current URL with new variable called form_submitted and equal to 1.
* If u want link to the URL u can i.e. do this:
* $newspage = new URL();
* $newspage->addVal("module","news");
* echo $newspage->A();
*
* Changelog
* 14 march:
* + added Clear() method
* + fixed error in Build() method
* + comments to methods are added
*/
class URL
{
var $Text;
var $Scheme;
var $Host;
var $Port;
var $Path;
var $Query;
var $Fragment;
var $Dynamic; // TRUE if URL have GET vars
var $Valid;
var $Args = array();
var $Cache; // cached previous build of URL
/**
* URL::URL()
*
* @param mixed $Text U can specify URL that different from current
* @return void
**/
function URL($Text = FALSE)
{
global $HTTP_SERVER_VARS;
if ( $Text )
$this->Text = $Text;
else
$this->Text = "http://".$HTTP_SERVER_VARS["HTTP_HOST"].$HTTP_SERVER_VARS["REQUEST_URI"];
if ( $this->parseURL() )
$this->Valid = TRUE;
else
$this->Valid = FALSE;
}
/**
* URL::parseURL()
* This method is private, it parses URL on the parts.
* @return boolean URL is right or not;
**/
function parseURL()
{
$tmp = parse_url( $this->Text );
if ( isSet($tmp["scheme"]) )
$this->Scheme = $tmp["scheme"];
else
return (FALSE);
if ( isSet($tmp["host"]) )
$this->Host = $tmp["host"];
else
return (FALSE);
if ( isSet($tmp["path"]) )
$this->Path = $tmp["path"];
else
return(FALSE);
if ( isSet($tmp["query"]) )
$this->Query = $tmp["query"];
if ( isSet($tmp["fragment"]) )
$this->Fragment = $tmp["fragment"];
if ( isSet($tmp["port"]) )
$this->Port = $tmp["port"];
unset($tmp);
if ( isSet($this->Query) )
$this->Dynamic = TRUE;
else
$this->Dynamic = FALSE;
if ( $this->Dynamic )
{
$temp = explode("&",$this->Query);
$i = 0;
while ( list($key, $val) = each ($temp) )
{
$tmp = explode("=",$val);
$this->Args[$tmp[0]] = $tmp[1];
$i++;
}
}
return (TRUE);
}
/**
* URL::dropVal()
* Drops a key from URL.
* @param mixed $key A key of value to drop.
* @return string URL if ok or echo about error.
**/
function dropVal($key)
{
if ( isSet($this->Args[$key]) )
$this->Args[$key] = NULL;
else
echo "Key not found.";
return $this->Build();
}
/**
* URL::Clear()
* Clears previous URL and let u work with another.
* @param string $Text This can be used to work with specific URL, not the current one.
* @return void
**/
function Clear()
{
$this->URL();
empty($this->Args);
}
/**
* URL::getVal()
* Gets a value from URL. (Even that values that are from
* @param $key
* @return mixed key if everything is OK, or echo'es that key is not found.
**/
function getVal ($key)
{
if ( isSet($this->Args[$key]) )
return $this->Args[$key];
else
echo "Key not found.";
}
/**
* URL::addVal()
* Adds a key to URL.
* @param mixed $key A key to add.
* @param mixed $value Value of the key
* @return string URL
**/
function addVal ($key, $value)
{
if ( !isSet($this->Args[$key]) )
$this->Args[$key] = $value;
else
echo "Key already exists.";
return $this->Build();
}
/**
* URL::setVal()
*
* @param mixed $key Key name for parameter.
* @param mixed $value Value for parameter.
* @param boolean $create Create new key if not exists.
* @return Echo if key not found and builded URL if everything ok.
**/
function setVal ($key, $value, $create=FALSE)
{
if ( isSet($this->Args[$key]) or $create == TRUE)
$this->Args[$key] = $value;
else
echo "Key not found.";
return $this->Build();
}
/**
* URL::is_Set()
* Checks if key is set in the URL.
* @param mixed $key
* @return boolean
**/
function is_Set ($key)
{
if ( isSet($this->Args[$key]) )
return TRUE;
else
return FALSE;
}
/**
* URL::Build()
* This is can be used to build a URL.
* @param boolean $full Set to TRUE if u want full URL (with hostname etc)
* @return string URL
**/
function Build ($full = FALSE)
{
$url = "";
if ($full)
{
$url = $this->Scheme."://";
$url .= $this->Host;
if ( isSet($this->Port) )
$url .= ":".$this->Port;
}
$url .= $this->Path;
$i = 0;
foreach ( $this->Args as $key => $value )
{
if ( $i == 0 ) $url .= "?";
if ( !is_Null($value) )
{
$url .= $key."=".$value."&";
}
$i=1;
}
if ( $i > 0 )
{
$url = substr_replace($url, '', -1);
}
if ( isSet($this->Fragment) )
$url .= "#".$this->Fragment;
$this->Cache = $url;
return $url;
}
/**
* URL::A()
* Returns builded URL with <A> tags
* @param string $name Name of link, it will be like this: <A HREF=...>$name</A>
* @param boolean $full Set to TRUE if u want full URL (with hostname etc)
* @return string URL with tags
**/
function A($name = FALSE, $full = FALSE)
{
$url = $this->Build($full);
if ( !$name )
$name = $url;
return "<A HREF=".$url.">".$name."</A>";
}
}
?>
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