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Homephp教程php手册简单的验证码生成,简单验证码生成

简单的验证码生成,简单验证码生成

for($i=0;$i5;$i++){

    $rand .= dechex(rand(1,15));  // 随机数16进制 1-F 生成5个

}

 

 

$im = imagecreatetruecolor(100,30);      // 验证码的大小(画板)

$bg = imagecolorallocate($im, 0,0,0);     // 背景颜色

 

for($i0;$i100;$i++){

    $color_dian = imagecolorallocate($im, rand(0,255),rand(0,255),rand(0,255));

    imagesetpixel($im, rand()%100, rand()%30, $color_dian); // 在画板上画点

}

$color_font = imagecolorallocate($im, rand(88,255), rand(88,255), rand(100,255));  // 设置颜色 文字的颜色

$color_line = imagecolorallocate($im, rand(0,255),rand(0,255),rand(0,255)); // 设置颜色 线的颜色

 

imageline($im, rand(1,10), rand(5,13), rand(80,100), rand(5,15), $color_line);  // 线 从第二个参数开始  线头的x轴  、y轴 、结束的x轴 、y轴、 赋予的颜色

 imagestring($im,5,rand(4,60), rand(3,10), $rand ,$color_font);    // 在画板上 写入 生成的码 从第二个参数开始   字体的属性、显示在画板上的位置x轴、y轴、随机验证码、颜色

// imagettftext($im, 12, 0, 12, 20, $color_font, 'haha.ttf', "我狠");   在画板上写字

 

header("Content-type:image/jpeg");   // 声明要输出的是什么东西

imagejpeg($im);  // 以jpeg格式输出图片到浏览器

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