How can PHP developers ensure that email addresses are properly formatted and separated for efficient newsletter distribution?

To ensure email addresses are properly formatted and separated for efficient newsletter distribution, PHP developers can use the `explode()` function to split a string of email addresses by a specified delimiter (such as a comma or semicolon). This will separate each email address into individual elements of an array, allowing for easy iteration and validation before sending out newsletters. 

$emailList = "john@example.com, jane@example.com, bob@example.com";
$emails = explode(',', $emailList);

foreach($emails as $email) {
    $email = trim($email); // remove any extra whitespace
    if(filter_var($email, FILTER_VALIDATE_EMAIL)) {
        // send newsletter to $email
    } else {
        echo "Invalid email address: $email";
    }
}

Keywords

PHP email validation regular expressions explode function newsletter distribution

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