hnhx-archive/captcha
1
0
Fork 0
mirror of https://github.com/hnhx/captcha.git synced 2025-01-09 11:17:26 -03:00
Code Issues Projects Releases Packages Wiki Activity

Add files via upload

Browse source
This commit is contained in:
Hanna 2022-03-17 11:21:11 +01:00 committed by GitHub
parent 7d0225f1c2
commit b53d4577cc
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
2 changed files with 82 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

57
captcha.php Normal file
View file

@ -0,0 +1,57 @@
<?php
function random_string()
{
//$chars = array_merge(range("A", "Z"), range("a", "z"), range(0, 9));
$chars = array_merge(range("A", "Z"), range(0, 9));
$random_str = "";
for($i=0; random_int(4,8)>$i; $i++)
$random_str .= $chars[random_int(0, count($chars)-1)];
return $random_str;
}
function hex_to_rgb($hex)
{
list($r, $g, $b) = sscanf($hex, "#%02x%02x%02x");
return array($r, $g, $b);
}
function create_captcha($captcha_string,$width,$height,$bg,$fg)
{
$im = imagecreate($width, $height);
$bg_rgb = hex_to_rgb($bg);
$fg_rgb = hex_to_rgb($fg);
$background_color = imagecolorallocate($im, $bg_rgb[0], $bg_rgb[1], $bg_rgb[2]);
$text_color = imagecolorallocate($im, $fg_rgb[0], $fg_rgb[1], $fg_rgb[2]);
$text_x = 0;
for($i=0; strlen($captcha_string)>$i; $i++)
{
$text_y = random_int(0, $height- ($height*0.60));
imagestring($im, 5, $text_x, $text_y, $captcha_string[$i], $text_color);
$text_x += 10 + random_int(0, $width / 10 - 5);
}
for($i=0; random_int(8, 15)>$i; $i++)
imageline($im, random_int(0,$width), random_int(0,$height), random_int(0,$width), random_int(0,$width), $text_color);
imagepng($im);
imagedestroy($im);
}
header("Content-Type: image/png");
$captcha_string = random_string();
$width = 130;
$height = 30;
$bg = "#000000";
$fg = "#ffffff";
create_captcha($captcha_string,$width,$height,$bg,$fg);
session_start();
$_SESSION["captcha"] = $captcha_string;
?>

25
example.php Normal file
View file

@ -0,0 +1,25 @@
<!DOCTYPE html>
<html>
<head>
<title>Captcha example</title>
</head>
<body>
<form method="post">
<input type="text" name="captcha">
<button type="submit">Check</button>
</form>
<img src="captcha.php" alt="captcha">
<?php
if (isset($_REQUEST["captcha"]))
{
session_start();
echo "<p>";
echo ($_SESSION["captcha"] == $_REQUEST["captcha"] ? "Valid" : "Invalid") . " captcha";
echo "</p>";
}
?>
</body>
</html>