php容易验证码
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2022-05-18 18:03:28
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php简单验证码
length; $i ++) { //循环随机取字符生成字符串 $strNum .= $strings [rand ( 0, $count - 1 )]; } session_start (); $_SESSION ["verifycode"] = $strNum; $this->im = imagecreate ( $this->width, $this->height ); $backgroundcolor = imagecolorallocate ( $this->im, 255, 255, 255 ); //生成背景色 $frameColor = imageColorAllocate ( $this->im, 0, 255, 0 ); for($i = 0; $i length; $i ++) { $charY = ($this->height + 9) / 2 + rand ( - 1, 1 ); //定义字符Y坐标 $charX = $i * 15 + 8; //定义字符X坐标 // $text_color = imagecolorallocate($this->im, 255, 0, 0); //生成字符颜色 $text_color = imagecolorallocate ( $this->im, mt_rand ( 50, 255 ), mt_rand ( 50, 128 ), mt_rand ( 50, 200 ) ); $angle = rand ( - 20, 20 ); //生成字符角度 //写入字符 imagettftext ( $this->im, $this->fontSize, $angle, $charX, $charY, $text_color, $this->font, $strNum [$i] ); } for($i = 0; $i im, mt_rand ( 0, 255 ), mt_rand ( 0, 255 ), mt_rand ( 0, 255 ) ); $linex = mt_rand ( 1, $this->width - 1 ); $liney = mt_rand ( 1, $this->height - 1 ); imageline ( $this->im, $linex, $liney, $linex + mt_rand ( 0, 4 ) - 2, $liney + mt_rand ( 0, 4 ) - 2, $linecolor ); } for($i = 0; $i im, mt_rand ( 0, 255 ), mt_rand ( 0, 255 ), mt_rand ( 0, 255 ) ); imagesetpixel ( $this->im, mt_rand ( 1, $this->width - 1 ), mt_rand ( 1, $this->height - 1 ), $pointcolor ); } imagerectangle ( $this->im, 0, 0, $this->width - 1, $this->height - 1, $frameColor ); //画边框 ob_clean (); header ( 'Content-type:image/png' ); imagepng ( $this->im ); imagedestroy ( $this->im ); }}$img = new VerifyImg ();$img->Build ();?>
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