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50 lines
1.5 KiB
PHP
50 lines
1.5 KiB
PHP
<?
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if (!function_exists('imagettftext')) { die('Captcha requires both the GD library and the FreeType library.'); }
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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++) { $CaptchaString.=$Chars[mt_rand(0,strlen($Chars)-1)]; }
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for($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)*.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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