What are some common methods to stop a PHP script from continuously sending emails to customers?

One common method to stop a PHP script from continuously sending emails to customers is to implement a flag or a check to limit the number of emails sent within a specific time frame. This can help prevent the script from spamming customers with multiple emails. 

// Set a variable to track the number of emails sent
$emailCount = 0;

// Limit the number of emails sent to customers
if ($emailCount < 3) {
    // Send email code here
    $emailCount++;
} else {
    // Limit reached, do not send any more emails
    echo "Email limit reached. Please try again later.";
}

Keywords

PHP email throttling rate limiting cron job

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