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How can PHP developers ensure that email validation functions are secure and reliable?

To ensure that email validation functions are secure and reliable, PHP developers should use built-in PHP functions like filter_var() with the FILTER_VALIDATE_EMAIL flag. This function will check if the email address is in a valid format and return true or false accordingly. Additionally, developers should also consider implementing additional checks such as checking the domain's MX records to verify the email address's existence.

php 
$email = "example@example.com";

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Email is valid
    echo "Email is valid.";
} else {
    // Email is not valid
    echo "Email is not valid.";
}

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