In each of these use cases, $value
represents an
arbitrary scalar value.
Whitelist Filtering:
<?php if ($email = Zend_Filter::isEmail($value)) { /* $email is a valid email format. */ } else { /* $email is not a valid email format. */ } ?>
Blind Filtering:
<?php $alphaName = Zend_Filter::getAlpha($value); ?>
Blacklist Filtering:
<?php $taglessComment = Zend_Filter::noTags($value); ?>