Input Validation in the PHP Manual

[Glese]

Where in the PHP manual can I find information about input validation? I looked and I seem to not find it.

 

I am intending to create my own email input validation.

[awjudd]

Have you looked at the filter[/code] functions?

 

~awjudd

[Glese]

Validating an email is that easy nowadays? Did I understand right, all I have to do is:

 

filter_var($email, FILTER_VALIDATE_EMAIL);

 

 

Is this accurate, the way how I have understood it?

 

How can I tell, what FILTER_VALIDATE_EMAIL finally is doing or how exactly it is filtering, does documentation state this somewhere?

[salathe]

How can I tell, what FILTER_VALIDATE_EMAIL finally is doing or how exactly it is filtering, does documentation state this somewhere?

 

The internal workings generally aren't documented, and what exactly this email validation accepts as valid would take a lot of describing (though it would be nice to have this).  This email validation simply uses a regular expression. The exact regular expression used has changed over time since FILTER_VALIDATE_EMAIL was introduced, but you can see it in the PHP source code.  Here it is for the upcoming PHP 5.4, http://svn.php.net/viewvc/php/php-src/branches/PHP_5_4/ext/filter/logical_filters.c?view=markup#l499