php function code to get website address

/**
* Get the full address of the website
* by bbs.it-home.org
*/
function getRootUrl(){
 $name = '';
 if ( isset($_SERVER['HTTP_HOST']) ) {
 $name = $_SERVER['HTTP_HOST'];
 }else{
 $name = $_SERVER['SERVER_NAME'];
 }
 if ( strpos($name,':') === false && $_SERVER ['SERVER_PORT'] != 80 ){
 $name .= ':'.$_SERVER['SERVER_PORT'];
 }
 $path = $_SERVER['PHP_SELF'];
 $path = substr($path, 0,strrpos($path,'/')+1);
 return 'http://'.$name . $path;
}

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