I want to add php script in Fast Secure Contact Form

Yes
https://www.fastsecurecontactform.com/do-action-hook-for-mail-sent

thanks for your reply.. I am facing an error, can you tell me, what I am doing wrong?
error shows in line: if ( !in_array($form->form_number, $forms) && $all_forms != true;)

[ Moderator note: Code fixed. You missed a closing backtick. That was a single quote that you used. ]

<?php
function my_process_fsctf_mail_sent($form) {

##################################
 // control which forms you want this on
 $all_forms = false; // set to true for process on all forms, or false to use settings below
 $forms = array('1');  // one or more individual forms
 ##################################
 if ( !in_array($form->form_number, $forms) && $all_forms != true;)
 return;

if ( $form->form_number == 1 ) {
  foreach ($form->posted_data as $name => $value) { 

     $timezone = new DateTimeZone("Asia/Kolkata" );
//$tm = (date("l d F Y h:i:s A"));
		$con = mysql_connect('host_ip','database_user','password');
		$db = mysql_select_db('database_name',$con);
				$date = new DateTime();
$date->setTimezone($timezone );
//$tm=$date->format( 'H:i:s A / D, M jS, Y' );
$tm=$date->format( 'H:i:s A' );
$time = $date->format('H');
	$ip = $_SERVER["REMOTE_ADDR"];
$dt =$date->format("j/n/Y");

$sql = mysql_query("INSERT INTO Enquiry(Name,Email,Mobile,Course,City,Query,IP,Time,Date,Bytime) VALUES('$name','$email','$mobile','$course','$city','$query','$ip','$tm','$dt','$time') ");

$res = mysql_query(" insert into SEO(Name,Email,Mobile,Course,City,Query,Time,Date,IP) values('$name','$email','$mobile','$course','$city','$query','$tm','$dt','$ip')");

  }
}

if ( $form->form_number == 2 ) {
  foreach ($form->posted_data as $name => $value) { 

     //do whatever code B you want here

  }
}

// do not return a string, because this is only an action hook
return;

} // end function
// Hook into Fast Secure Contact Form after email sent
add_action('fsctf_mail_sent', 'my_process_fsctf_mail_sent');
?>