Check URL...How to add http:// and https:// and www in ur existing url if not present in url in php?
<?php
echo "<pre>";

$url = "ervijaysinhparmar.blogspot.com";//$_SERVER['HTTP_HOST'];

echo "User URL::<b>".$url."<b><br>";

//$pattern= "#^http://www\.|https://www\.[a-z0-9-_.]+\.[a-z]{2,4}$#i";

// [VERY] Quick email check:
if(stristr($url, "http://") ) {
    //echo "Ok";
}
elseif(stristr($url, "https://") ) {
    //echo "Ok";
}
else{
//echo "No";
$url = "http://".$url;
}
if (stristr($url, "www.") ) {
    //echo "Ok";
}
else{
    //echo "www. is not available";
    $parse = parse_url($url);
    $url = $parse['scheme']."://www.".$parse['host'];
}

echo "Final URL::<br><b>".$url."<b><br>";
exit;
?>
By Vijaysinh Parmar.