PHP Parse error: syntax error, unexpected '&&' (T_BOOLEAN_AND), where is error located?

<?php
if(isset($_POST['inputName3']) && isset($_POST['inputEmail3']) && isset($_POST['inputSite3']) && isset($_POST['inputMessage3']))
{
$inputName3 = $_POST['inputName3'];
$inputEmail3 = $_POST['inputEmail3'];
$inputSite3 = $_POST['inputSite3'];
$inputMessage3 = $_POST['inputMessage3'];

if(!empty($inputName3) && !empty($inputEmail3) &&!empty($inputSite3) &&!empty($inputMessage3) )
{
if(strlen($inputName3)>25 || strlen($inputEmail3)>50 || strlen($inputSite3)>30 || strlen($inputMessage3)>1000){
  echo 'Sorry, maxlength for some field has been exceeded';
 }else{
  $to = 'ahammad559@gmail.com';
 $subject = 'This is an email';
 $body = $inputName3."\n\n".$inputMessage3 ;
 $headers = 'From : "php academy" <ahammad559@gmail.com>';
 if(@mail($to, $subject, $body, $headers)){
 echo 'Thanks for contacting us.we\'ll be touch in soon.';
 }else{
 echo 'Sorry, an error occurred.Please try again';
 }
 }
}
else{
 echo'all fields are required';
}
}
?>