FILTER_VALIDATE_EMAIL & FILTER_SANITIZE_EMAIL to sanitize or validate email in PHP

Validate an email address

FILTER_VALIDATE_EMAIL checks whether a value has a valid email-address format. A format check does not prove that the mailbox exists or can receive mail.

$email = 'user@example.com';
if (filter_var($email, FILTER_VALIDATE_EMAIL) !== false) {
    echo 'Valid email format';
}

$email='userid@domain.com';

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

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

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 variable 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

Filter reference Validating URL Validating Boolean data Ctype_alnum to check alphanumeric characters Validating Email address

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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