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| <?php | |
| session_start(); | |
| $_SESSION['count'] = time(); | |
| $image; | |
| ?> | |
| <title>demo.php</title> | |
| <body style="background-color:#ddd; "> | |
| <?php | |
| $flag = 5; | |
| if (isset($_POST["flag"])) { | |
| $input = $_POST["input"]; | |
| $flag = $_POST["flag"]; | |
| } | |
| if ($flag == 1) { | |
| if ($input == $_SESSION['captcha_string']) { | |
| ?> | |
| <div style="text-align:center;"> | |
| <h1>Your answer is correct!</h1> | |
| <form action=" <?php echo $_SERVER['PHP_SELF']; ?>" method="POST"> | |
| <input type="submit" value="refresh the page"> | |
| </form> | |
| </div> | |
| <?php | |
| } else { | |
| ?> | |
| <div style="text-align:center;"> | |
| <h1>Your answer is incorrect!<br>please try again </h1> | |
| </div> | |
| <?php | |
| create_image(); | |
| display(); | |
| } | |
| } else { | |
| create_image(); | |
| display(); | |
| } | |
| function display() | |
| { | |
| ?> | |
| <div style="text-align:center;"> | |
| <h3>TYPE THE TEXT YOU SEE IN THE IMAGE</h3> | |
| <b>This is just to check if you are a robot</b> | |
| <div style="display:block;margin-bottom:20px;margin-top:20px;"> | |
| <img src="image<?php echo $_SESSION['count'] ?>.png"> | |
| </div> | |
| <form action=" <?php echo $_SERVER['PHP_SELF']; ?>" method="POST" | |
| / > | |
| <input type="text" name="input"/> | |
| <input type="hidden" name="flag" value="1"/> | |
| <input type="submit" value="submit" name="submit"/> | |
| </form> | |
| <form action=" <?php echo $_SERVER['PHP_SELF']; ?>" method="POST"> | |
| <input type="submit" value="refresh the page"> | |
| </form> | |
| </div> | |
| <?php | |
| } | |
| function create_image() | |
| { | |
| global $image; | |
| $image = imagecreatetruecolor(200, 50) or die("Cannot Initialize new GD image stream"); | |
| $background_color = imagecolorallocate($image, 255, 255, 255); | |
| $text_color = imagecolorallocate($image, 0, 255, 255); | |
| $line_color = imagecolorallocate($image, 64, 64, 64); | |
| $pixel_color = imagecolorallocate($image, 0, 0, 255); | |
| imagefilledrectangle($image, 0, 0, 200, 50, $background_color); | |
| for ($i = 0; $i < 3; $i++) { | |
| imageline($image, 0, rand() % 50, 200, rand() % 50, $line_color); | |
| } | |
| for ($i = 0; $i < 1000; $i++) { | |
| imagesetpixel($image, rand() % 200, rand() % 50, $pixel_color); | |
| } | |
| $letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; | |
| $len = strlen($letters); | |
| $letter = $letters[rand(0, $len - 1)]; | |
| $text_color = imagecolorallocate($image, 0, 0, 0); | |
| $word = ""; | |
| for ($i = 0; $i < 6; $i++) { | |
| $letter = $letters[rand(0, $len - 1)]; | |
| imagestring($image, 7, 5 + ($i * 30), 20, $letter, $text_color); | |
| $word .= $letter; | |
| } | |
| $_SESSION['captcha_string'] = $word; | |
| $images = glob("*.png"); | |
| foreach ($images as $image_to_delete) { | |
| @unlink($image_to_delete); | |
| } | |
| imagepng($image, "image" . $_SESSION['count'] . ".png"); | |
| } | |
| ?> | |
| </body> |
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