Obfuscate a string to prevent spam-bots from sniffing it.

obfuscate.php

<?php

#BlackLivesMatter

/**
 * Obfuscate a string to prevent spam-bots from sniffing it.
 */
function obfuscate(string $value): string
{
    $safe = '';

    foreach (str_split($value) as $letter) {
        $code = ord($letter);

        if ($code > 128) {
            return $letter;
        }
        
        $safe = $safe . match (random_int(1, 3)) {
            1 => '&#' . $code . ';',
            2 => '&#x' . dechex($code) . ';',
            default => $letter
        };
    }

    return $safe;
}

// echo obfuscate('oss@bmhv.org');