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Filename : refresh_captcha.php

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<?php
session_start();
function generateCaptcha() {
    // $characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
     $characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%&*()=+[]{}|;:<>?';

    $captcha = '';
    for ($i = 0; $i < 6; $i++) {
        $captcha .= $characters[rand(0, strlen($characters) - 1)];
    }
    $_SESSION['captcha'] = $captcha;
    return $captcha;
}
echo generateCaptcha();
?>