lib/classes/Swift/Mime/SimpleMimeEntity.php
public function getBoundary()
    {
        if (!isset($this->boundary)) {
            $this->boundary = '_=_swift_'.time().'_'.bin2hex(random_bytes(16)).'_=_';
        }

        return $this->boundary;
    }
public function getBoundary()
    {
        if (!isset($this->boundary)) {
            $this->boundary = '_=_swift_'.time().'_'.bin2hex(random_bytes(16)).'_=_';
        }

        return $this->boundary;
    }
public function getBoundary ( ) { if ( ! isset ( $ this -> boundary ) ) { $ this -> boundary = '_=_swift_' . time ( ) . '_' . bin2hex ( random_bytes ( 16 ) ) . '_=_' ; } return $ this -> boundary ; }
Get the boundary used to separate children in this entity.

@return string
Get the boundary used to separate children in this entity .