Essential Books

Validate Email Address

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When filtering an email address filter_var() will return the filtered data, in this case the email address, or false if a valid email address cannot be found: 

var_dump(filter_var('john@example.com', FILTER_VALIDATE_EMAIL));
var_dump(filter_var('notValidEmail', FILTER_VALIDATE_EMAIL));

Results: 

string(16) "john@example.com"
bool(false)

This function doesn’t validate not-latin characters. Internationalized domain name can be validated in their xn-- form.

Note that you cannot know if the email address is correct before sending an email to it. You may want to do some extra checks such as checking for a MX record, but this is not necessary. If you send a confirmation email, don’t forget to remove unused accounts after a short period.

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Filters, filter functions:
* Filters Filter Functions
* Validate Email Address
* Validating A Value Is An Integer
* Validating An Integer Falls In A Range
* Validate a URL
* Sanitize filters
* Validating Boolean Values
* Validating A Number Is A Float
* Validate A MAC Address
* Sanitze Email Addresses
* Sanitize Integers
* Sanitize URLs
* Sanitize Floats
* Validate IP Addresses
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