PHP生成图片验证码
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2022-05-19 09:37:42
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/** * 验证码类,用于产生各种验证码 */class captcha{ /** * 生成验证码 * @param int $length 码字符长度 * @param int $width 宽度 * @param int $height 长度 * @param string $type 类型 * @return */ public static function getCode($length=4,$width=50,$height=22,$type='png') { //session_start(); $randval = self::randString($length); //$_SESSION['captcha']= $randval; $width = ($length*9+10)>$width?$length*9+10:$width; if ( $type!='gif' && function_exists('imagecreatetruecolor')) { $im = @imagecreatetruecolor($width,$height); }else { $im = @imagecreate($width,$height); } $r = Array(225,255,255,223); $g = Array(225,236,237,255); $b = Array(225,236,166,125); $key = mt_rand(0,3); $backColor = imagecolorallocate($im, $r[$key],$g[$key],$b[$key]); //背景色(随机) $borderColor = imagecolorallocate($im, 100, 100, 100); //边框色 $pointColor = imagecolorallocate($im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255)); //点颜色 @imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backColor); @imagerectangle($im, 0, 0, $width-1, $height-1, $borderColor); $stringColor = imagecolorallocate($im,mt_rand(0,200),mt_rand(0,120),mt_rand(0,120)); // 干扰 for($i=0;$i以上是完整的生成图片验证码的方法,下面是使用该方法生成验证码:
include "../lib/captcha.class.php"; $captcha = new captcha(); $checkCode = $captcha->getCode(4,75,32); echo $checkCode;最后在页面显示的效果就是这样,刷新一次重新生成一个: