ACC SHELL

<?php
class TF_Validate_Phone extends Zend_Validate_Abstract
{
    const NOT_PHONE_NUMBER = 'notPhoneNumber';

    /**
     * @var array
     */
    protected $_messageTemplates = array(
        self::NOT_PHONE_NUMBER => "'%value%' is not a phone number."
    );

    /**
     * Defined by Zend_Validate_Interface
     *
     * Returns true if and only if $value is a valid phone number
     *
     * @param  string $value
     * @return boolean
     */
    public function isValid($value)
    {
    	$arr = array();
    	$pattern = '^[ 0-9\.\+]{8,}$';
    	if(eregi($pattern, (string)$value, $arr)){
    		return true;
    	} else {
    		$this->_error(self::NOT_PHONE_NUMBER, $value);
    		return false;	
    	}
    }
}