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Php - Validate E-Mail
The easiest and safest way to check whether an email address is well-formed is to use PHP's filter_var() function.
In the code below, if the e-mail address is not well-formed, then store an error message:
When Return ture this email format is valid.
filter_var($email, FILTER_VALIDATE_EMAIL)
Can Check alternative idea
$email = 'sazzad@nextzen.com.bd';
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
$emailErr = "Invalid email format";
}