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PHP secure mail

Need to write a code to send secure mail in php

If no preventive measures are taken while coding  a contact or feedback form in php, the code can be used by spammers to spam others. In this page, we will discuss how to write php mailing code so that it can not be compromised to spam.

A typical php code for mailing:

A PHP script for sending email calls mail() function to deliver the email. The code looks like this:

mail( [email protected]", "your feedback", $message, "From: $email" );

Where [email protected] is the address of the webmaster and $message and $email are a message and email collected from the feedback or contact form.
Unless preventive measures are taken, it is possible for a spammer to inject additional headers into the email messages by placing lines like the following into the $email variable

[email protected]  
CC:[email protected],[email protected],[email protected]

When this code is executed, all the email addresses added to the list are going to receive mails, which is unintended and will solve the purpose of the spammers.

How to write a secure code for mailing with php:

if ( preg_match( "/[\r\n]/", $usr ) || preg_match( "/[\r\n]/", $email ) ) {
    header("location : https://www.example.com/mail-error.php");
}

Here, preg_match function will check of the user name (stored in $usrname) and email (stored in $email) contains any newline characters. If newline characters are found, then somebody trying to compromise the script to spam. In that case, the code will redirect to a page like  https://www.example.com/mail-error.php instead of sent mail.

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC