PHP contact form goes to a blank page -

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my beloved php contact form goes blank page, email not going through either. i've added echo function @ end see if goes through entire code. worked, echoed line showing up. quite newbie in php, please don't bite head off. project i'm working on: http://www.designbynoemi.co.uk.

any direction highly appreciated.

and here code:

    <?php /* * contact form class */  error_reporting(e_all); ini_set('display_errors', 1);  header('cache-control: no-cache, must-revalidate'); header('expires: mon, 26 jul 1997 05:00:00 gmt'); header('content-type: application/json');  $admin_email = 'contact@designbynoemi.co.uk'; // email $message_min_length = 5; // min message length   class contact_form{     function __construct($details, $email_admin, $message_min_length){          $this->name = stripslashes($details['name']);         $this->email = trim($details['email']);         $this->subject = 'contact website'; // subject          $this->message = stripslashes($details['message']);          $this->email_admin = $email_admin;         $this->message_min_length = $message_min_length;          $this->response_status = 1;         $this->response_html = '';     }       private function validateemail(){         $regex = '/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i';          if($this->email == '') {              return false;         } else {             $string = preg_replace($regex, '', $this->email);         }          return empty($string) ? true : false;     }       private function validatefields(){         // check name         if(!$this->name)         {             $this->response_html .= '<p>please enter name</p>';             $this->response_status = 0;         }          // check email         if(!$this->email)         {             $this->response_html .= '<p>please enter e-mail address</p>';             $this->response_status = 0;         }          // check valid email         if($this->email && !$this->validateemail())         {             $this->response_html .= '<p>please enter valid e-mail address</p>';             $this->response_status = 0;         }          // check message length         if(!$this->message || strlen($this->message) < $this->message_min_length)         {             $this->response_html .= '<p>please enter message. should have @ least '.$this->message_min_length.' characters</p>';             $this->response_status = 0;         }     }       private function sendemail(){         $mail = mail($this->email_admin, $this->subject, $this->message,              "from: ".$this->name." <".$this->email.">\r\n"             ."reply-to: ".$this->email."\r\n"         ."x-mailer: php/" . phpversion());          if($mail)         {             $this->response_status = 1;             $this->response_html = '<p>thank you!</p>';         }     }       function sendrequest(){         $this->validatefields();         if($this->response_status)         {             $this->sendemail();         }          $response = array();         $response['status'] = $this->response_status;            $response['html'] = $this->response_html;          echo json_encode($response);     } }   $contact_form = new contact_form($_post, $admin_email, $message_min_length); $contact_form->sendrequest();  echo "hello world!";   ?>


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