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<?php
/**
* The right way to do a SEO HTTP Redirection. (says me)
*
* @copyright Claude "CodeAngry" Adrian
* @link http://codeangry.com/
* @license WTFPL
*/
namespace CA;
/**
* Redirection is permanent, resource moved.
*/
const HttpRedirect_Permanent = 301;
/**
* Redirection is temporary, resource still lives here.
*/
const HttpRedirect_Temporary = 302;
/**
* The right way to do a Redirection (SEO friendly and such).
* If returns false then you can't code!
*
* @param string $URL
* @param int $StatusCode
* @return bool
*/
function HttpRedirect($URL, $StatusCode = 302){
//<ARGS:VALIDATE>
// Validate URL
if(empty($URL)){
$URL = $_SERVER['REQUEST_URI']; // Empty falls back to current
}
if(!is_string($URL) or !strlen($URL = trim($URL))){
trigger_error('$URL has to be a proper string, you non-coder.', E_USER_WARNING);
return false; // So bad it hurts!
}
// Validate Status Code
if(empty($StatusCode)){
$StatusCode = 302;
}
if(!is_numeric($StatusCode) or (intval(($StatusCode = intval($StatusCode)) / 100) != 3)){
trigger_error('HTTP $StatusCode must be in 3##, you non-coder.', E_USER_WARNING);
return false;
}
//</ARGS:VALIDATE>
// <PLAN:A>
// Do http redirect if headers are not sent
if(!headers_sent()){
header("Status: {$StatusCode} Relocated");
header("{$_SERVER['SERVER_PROTOCOL']} {$StatusCode} Relocated");
header("Location: {$URL}", $StatusCode);
}
// </PLAN:A>
// <PLAN:B> - Truth is one should NOT get here!
$URL_Escaped = htmlentities($URL); // For HTML tag output
if($StatusCode == 301){
// Do a rel=canonical if the HTTP 301 failed due to sent headers (similar effect for crawlers)
echo '<link rel="canonical" href="', $URL_Escaped, '"/>', PHP_EOL;
}
// Try to redirect with JS
echo '<script type="text/javascript">',
'window.location.href="', $URL, '";',
'</script>', PHP_EOL;
// Try to redirect Meta Redirect
echo '<meta http-equiv="refresh" content="0;url=', $URL_Escaped, '" />', PHP_EOL;
// </PLAN:B>
// <PLAN:C> - Truth is one should NEVER get here!
// Try to redirect with User
echo '<div><a href="', $URL_Escaped, '">', $URL_Escaped, '</a></div>';
// </PLAN:C>
return true;
}
/**
* Alias of HttpRedirect($URL, 302);.
*
* @param string $URL
* @return bool
*/
function HttpRedirected($URL){
return HttpRedirect($URL, 302);
}
/**
* Alias of HttpRedirect($URL, 301);.
*
* @param string $URL
* @return bool
*/
function HttpMoved($URL){
return HttpRedirect($URL, 301);
}
?>
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