FILTER_VALIDATE_EMAIL

We can check email address for validation by using FILTER_VALIDATE_EMAIL filter in PHP. Here is a sample code.

$email='userid@domain.com';

if(filter_var($email,FILTER_VALIDATE_EMAIL)){
echo " Yes validation passed ";
}else{
echo " No validation failed ";
}

In the above code in place of FILTER_VALIDATE_EMAIL we can use filter ID as 274

Validation of Email by GET method.

Whenever we receive any email address we can directly check like this ( without assigning any variable )

if(filter_var($_GET['email'],FILTER_VALIDATE_EMAIL)){
echo " Yes validation passed ";
}else{
echo " No validation failed ";
}

Inside our script before using email address we can check and assign a vaiable only if email validation is passed.

if(filter_var($_GET['email'],FILTER_VALIDATE_EMAIL)){
$email = $_GET['email'];
}else{
echo " Wrong email address ";
// stop execution or ask to re-submit
}

You can read how regular expressions is used to validate email address

FILTER_SANITIZE_EMAIL

The id of this filter is 517. We can sanitize any variable with email address to remove unwanted chars including blank space. This function FILTER_SANITIZE_EMAIL removes all except letters, digits and {|}!#/=$%*[]+-?^_`~&'@.
Here is an example

$str='use= rid@example.com41!5~6+7'; // Change this value to get different result
$str = filter_var($str,FILTER_SANITIZE_EMAIL);
echo $str;

Output is here

use=rid@example.com41!5~6+7

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