Header/CollectionHeader.php
function has($label)
    {
        $r = $this->getIterator()->find( array('label' => strtolower($label)) );
        foreach ($r as $v)
            return true;

        return false;
    }
function has($label)
    {
        $r = $this->getIterator()->find( array('label' => strtolower($label)) );
        foreach ($r as $v)
            return true;

        return false;
    }
function has ( $ label ) { $ r = $ this -> getIterator ( ) -> find ( array ( 'label' => strtolower ( $ label ) ) ) ; foreach ( $ r as $ v ) return true ; return false ; }
Has Header With Specific Label?

! headers label are case-insensitive

@param string $label

@return bool
Has Header With Specific Label?