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55 lines
1.6 KiB
PHP
55 lines
1.6 KiB
PHP
<?
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if (!function_exists('imagettftext')) {
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die('Captcha requires both the GD library and the FreeType library.');
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}
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function get_font() {
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global $CaptchaFonts;
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return SERVER_ROOT.'/classes/fonts/'.$CaptchaFonts[mt_rand(0, count($CaptchaFonts) - 1)];
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}
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function make_captcha_img() {
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global $CaptchaBGs;
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$Length = 6;
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$ImageHeight = 75;
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$ImageWidth = 300;
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$Chars = 'abcdefghjkmprstuvwxyzABCDEFGHJKLMPQRSTUVWXY23456789';
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$CaptchaString = '';
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for ($i = 0; $i < $Length; $i++) {
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$CaptchaString .= $Chars[mt_rand(0,strlen($Chars) - 1)];
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}
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for ($x = 0; $x < $Length; $x++) {
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$FontDisplay[$x]['size'] = mt_rand(24, 32);
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$FontDisplay[$x]['top'] = mt_rand($FontDisplay[$x]['size'] + 5, $ImageHeight - ($FontDisplay[$x]['size'] / 2));
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$FontDisplay[$x]['angle'] = mt_rand(-30, 30);
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$FontDisplay[$x]['font'] = get_font();
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}
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$Img = imagecreatetruecolor($ImageWidth, $ImageHeight);
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$BGImg = imagecreatefrompng(SERVER_ROOT.'/captcha/'.$CaptchaBGs[mt_rand(0, count($CaptchaBGs) - 1)]);
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imagecopymerge($Img, $BGImg, 0, 0, 0, 0, 300, 75, 50);
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$ForeColor = imagecolorallocatealpha($Img, 255, 255, 255, 65);
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for ($i = 0; $i < strlen($CaptchaString); $i++) {
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$CharX = (($ImageWidth / $Length) * ($i + 1)) - (($ImageWidth / $Length) * 0.75);
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imagettftext($Img,$FontDisplay[$i]['size'], $FontDisplay[$i]['angle'], $CharX,
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$FontDisplay[$i]['top'], $ForeColor,
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$FontDisplay[$i]['font'], $CaptchaString[$i]
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);
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}
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header('Content-type: image/png');
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imagepng($Img);
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imagedestroy($Img);
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return $CaptchaString;
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}
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$_SESSION['captcha'] = make_captcha_img();
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?>
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