43 lines
1.1 KiB
PHP
43 lines
1.1 KiB
PHP
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<?php
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session_start();
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header('Content-type: image/png');
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header('Cache-Control: no-cache, no-store, must-revalidate');
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header('Pragma: no-cache');
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header('Expires: 0');
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$width = 120;
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$height = 40;
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$chars = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
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$code = '';
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for ($i = 0; $i < 4; $i++) {
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$code .= $chars[rand(0, strlen($chars) - 1)];
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}
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$_SESSION['captcha'] = $code;
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$image = imagecreate($width, $height);
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$bg_color = imagecolorallocate($image, 255, 255, 255);
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$text_color = imagecolorallocate($image, 0, 0, 0);
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$noise_color = imagecolorallocate($image, 200, 200, 200);
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for ($i = 0; $i < 100; $i++) {
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imagesetpixel($image, rand(0, $width), rand(0, $height), $noise_color);
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}
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for ($i = 0; $i < 5; $i++) {
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imageline($image, rand(0, $width), rand(0, $height), rand(0, $width), rand(0, $height), $noise_color);
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}
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$font = 5;
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$x = 10;
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for ($i = 0; $i < 4; $i++) {
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$char_color = imagecolorallocate($image, rand(0, 150), rand(0, 150), rand(0, 150));
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imagestring($image, $font, $x, rand(8, 12), $code[$i], $char_color);
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$x += 25;
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}
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imagepng($image);
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imagedestroy($image);
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?>
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