Laravel 5.3 Increment 001 to 002 in code

Question

I have a registration_id in format KUTWJH210117001. Next time when the user posts the registration_id I want to increment it to KUTWJH210117002, but I'm getting the output as:

KUTWJH210117001  // the first time  
KUTWJH2101172    // next time it will be 
KUTWJH2101173    // and so on

The Code

public function setRegistrationIdAttribute($rid)
{
    $getLastRegistrationId = Driver::orderBy('id', 'desc')->first()->registration_id;
    $getDateToCheck = substr($getLastRegistrationId , 6, 6);

    if($getDateToCheck === date('dmy')) {
        $toIncrement = substr($getLastRegistrationId, -1);
        $increment =  float($toIncrement++);                       //i'm incrementing here
        $this->attributes['registration_id'] = $rid.date('dmy').$increment;
    }
    else 
    {
     $this->attributes['registration_id'] = $rid.date('dmy')."001";
    }
}

Thank you

Answer 1

Use sprintf to format:

$this->attributes['registration_id'] = $rid.date('dmy').sprintf("%03d", $increment);

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%03d - tells that you are formatting 3 digit number. So, zero's will be padding automatically.