Generate a simple verification code based on PHP, generate a simple verification code with PHP_PHP tutorial

Generate a simple verification code based on PHP. PHP generates a simple verification code

Without further ado, I will post the code directly for you. The specific code is as follows:

for($i=0;$i<5;$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($i<0;$i<100;$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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