<form method="post">

URL : <input type="text" id="url" name="url"  required><span id="error"></span>

<br><br>

<input type="submit" name="submit" value="Submit">

</form>

<?php

if(isset($_POST['submit'])) {

$apiURL = 'https://www.googleapis.com/urlshortener/v1/url';

$key = 'AIzaSyCEnEb17VbKbtR_9jp36i5mYZLSAowVICk';  // GOOGLE API KEY

$apiURL = $apiURL.'?key='.$key;

$url = $_POST['url'];

$ch = curl_init();

curl_setopt($ch,CURLOPT_URL,$apiURL);

curl_setopt($ch,CURLOPT_POST,1);

curl_setopt($ch,CURLOPT_POSTFIELDS,json_encode(array("longUrl"=>$url)));

curl_setopt($ch,CURLOPT_HTTPHEADER,array("Content-Type: application/json"));

curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);

$result = curl_exec($ch);

curl_close($ch);

$result = json_decode($result,true);

//print_r($result['id']);

echo 'Short URL :   <a href="'.$result['id'].'" style="color:red";" target="blank">'.$result['id'].'</a><br><br>';

}

?>