sometime we need to generate a random string of byte, For this purpose openssl_random_pseudo_bytes method is used,which gives us a random string of  byte.

Syntax

string openssl_random_pseudo_bytes (  $length ,$crypto_strong )

Parameters

openssl_random_pseudo_bytes method have two parameter one is length and other one is crypto_strong. These are explain below.

Length

The length parameter contain integer number which define the length of the byte code which are going to be generated.

Crypto_strong

This parameter contain a boolean value(true/false) that determine algorithm which is used should be strong or not.

In below code we are using openssl_random_pseudo_bytes method for generating a key which we will send with a link to user email id for reseting his password.

public function forgotPassword(){
    
          $this->layout="main";
	    if (!empty($this->request->data)) {
           
	       $result = $this->User->find('first', array('conditions' => array('User.email' => $this->request->data['User']['email'])));
	    
	       /*Create msg*/
	       $i=16;
	       $cstrong = true;
	       $bytes = openssl_random_pseudo_bytes($i, $cstrong);
	       $hex   = bin2hex($bytes);
           
	              
	       $msg='';
	       $msg.='Click on the link below for reseting your password.';
           $msg.='<a href="http://localhost/health/Users/resetPassword/'.$hex.'">Reset Password</a>';
	       $msg.='';
	       
	       $msg=wordwrap($msg,70);
	       try{
	        $Email = new CakeEmail();
	        $Email->from(array('me@example.com' => 'My Site'));
	        $Email->to($this->request->data['User']['email']);
	        $Email->subject("Forgot Password");
	        $Email->send($msg);
	        $this->request->data['User']['id'] = $result['User']['id'];
	        $this->request->data['User']['h_key'] = $hex;
	        if ($this->User->save($this->request->data)) {
	            $this->Session->setFlash('We have sent a link to your mailbox for reseting your password.');
	        }

	    }
	    catch(Exception $e){
	        echo 'Error:'.$e->getMessage();
	    }
	 }
   }