php - 如何验证我的 PHP 验证码不区分大小写？

Question

我希望提交验证码的用户能够输入大写和小写的混合，无论验证码图像说什么，并且验证码仍然可以验证。

因此，例如，如果验证码图像显示“r9zvk1”，用户应该能够输入“R9zvk1”并且仍然验证验证码是正确的。

我当前的验证码：

<?php
 
session_start();
 
$permitted_chars = 'abcdefghjklmnpqrstuvwxyz0123456789';
  
function generate_string($input, $strength = 10) {
    $input_length = strlen($input);
    $random_string = '';
    for($i = 0; $i < $strength; $i++) {
        $random_character = $input[mt_rand(0, $input_length - 1)];
        $random_string .= $random_character;
    }
  
    return $random_string;
}
 
$image = imagecreatetruecolor(200, 50);
 
imageantialias($image, true);
 
$colors = [];
 
$red = rand(125, 175);
$green = rand(125, 175);
$blue = rand(125, 175);
 
for($i = 0; $i < 5; $i++) {
  $colors[] = imagecolorallocate($image, $red - 20*$i, $green - 20*$i, $blue - 20*$i);
}
 
imagefill($image, 0, 0, $colors[0]);
 
for($i = 0; $i < 10; $i++) {
  imagesetthickness($image, rand(2, 10));
  $line_color = $colors[rand(1, 4)];
  imagerectangle($image, rand(-10, 190), rand(-10, 10), rand(-10, 190), rand(40, 60), $line_color);
}
 
$black = imagecolorallocate($image, 0, 0, 0);
$white = imagecolorallocate($image, 255, 255, 255);
$textcolors = [$black, $white];
 
$fonts = [dirname(__FILE__).'/fonts/font.ttf'];
 
$string_length = 5;
$captcha_string = generate_string($permitted_chars, $string_length);
 
$_SESSION['captcha_text'] = $captcha_string;
 
for($i = 0; $i < $string_length; $i++) {
  $letter_space = 170/$string_length;
  $initial = 15;
   
  imagettftext($image, 24, rand(-15, 15), $initial + $i*$letter_space, rand(25, 45), $textcolors[rand(0, 1)], $fonts[array_rand($fonts)], $captcha_string[$i]);
}
 
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>

我当前的验证码验证码：

<?PHP

    session_start();
    if($_POST['captcha'] != $_SESSION['captcha_text']) die("Sorry, the CAPTCHA code entered was incorrect!");
    session_destroy();


?>

标签： phpformscaptchacase-insensitive