自己写验证码的时候在文字定位上拿捏不准
于是把ci验证码主要部分扣了出来,看看,一般般,干扰线是亮点
代码去除了很多判断,简化了很多,显示效果一样
<?php
$defaults = array(
'word' => '',
'img_path' => './',
'img_url' => '',
'img_width' => '150',
'img_height' => '30',
'font_path' => './instance/font/Elephant.ttf',
'expiration' => 7200,
'word_length' => 4,
'font_size' => 16,
'img_id' => '',
'pool' => '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
'colors' => array(
'background' => array(255,255,255),
'border' => array(153,102,102),
'text' => array(204,153,153),
'grid' => array(255,182,182)
)
);
// 将变量从数组中取出
foreach ($defaults as $key => $val){
$$key = $val;
}
// 生成随机码
$word = '';
$pool_length = strlen($pool);
$rand_max = $pool_length - 1;
for ($i = 0; $i < $word_length; $i++){
$word .= $pool[mt_rand(0, $rand_max)];
}
// 验证码长度
$length = strlen($word);
//角度
$angle = ($length >= 6) ? mt_rand(-($length-6), ($length-6)) : 0;
$x_axis = mt_rand(6, (360/$length)-16);
$y_axis = ($angle >= 0) ? mt_rand($img_height, $img_width) : mt_rand(6, $img_height);
// 创建图片句柄
$im = imagecreatetruecolor($img_width, $img_height);
// 创建颜色
foreach ($colors as $key => $values)
{
$colors[$key] = imagecolorallocate($im, $colors[$key][0], $colors[$key][1], $colors[$key][2]);
}
// 画了个和图片等大的矩形,就是背景
ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $colors['background']);
// -----------------干扰线--------------------------
$theta = 1;
$thetac = 7;
$radius = 16;
$circles = 20;
$points = 32;
for ($i = 0, $cp = ($circles * $points) - 1; $i < $cp; $i++)
{
$theta += $thetac;
$rad = $radius * ($i / $points);
$x = ($rad * cos($theta)) + $x_axis;
$y = ($rad * sin($theta)) + $y_axis;
$theta += $thetac;
$rad1 = $radius * (($i + 1) / $points);
$x1 = ($rad1 * cos($theta)) + $x_axis;
$y1 = ($rad1 * sin($theta)) + $y_axis;
imageline($im, $x, $y, $x1, $y1, $colors['grid']);
$theta -= $thetac;
}
// --------------------------------------------------------------
// 无字体
// ($font_size > 5) && $font_size = 5;
// $x = mt_rand(0, $img_width / ($length / 3));
// $y = 0;
// for ($i = 0; $i < $length; $i++){
// $y = mt_rand(0 , $img_height / 2);
// imagestring($im, $font_size, $x, $y, $word[$i], $colors['text']);
// $x += ($font_size * 2);
// }
// 有字体
// x 第一个字符随机在图片的前面一小段,后面依次加一个字符大小的宽度
// y 图片的1/2到距离底部3px之间随机
($font_size > 30) && $font_size = 30;
$x = mt_rand(0, $img_width / ($length / 1.5));
$y = $font_size + 2;
for ($i = 0; $i < $length; $i++){
$y = mt_rand($img_height / 2, $img_height - 3);
imagettftext($im, $font_size, $angle, $x, $y, $colors['text'], $font_path, $word[$i]);
$x += $font_size;
}
//画矩形框
imagerectangle($im, 0, 0, $img_width - 1, $img_height - 1, $colors['border']);
// 删除以前保存的图片
$now = microtime(TRUE);
$current_dir = opendir($img_path);
while ($filename = readdir($current_dir)){
if (in_array(substr($filename, -4), array('.jpg', '.png'))&& (str_replace(array('.jpg', '.png'), '', $filename) + 0.1) < $now){
@unlink($img_path.$filename);
}
}
@closedir($current_dir);
// 拼接文件路径并保存
$img_url = rtrim($img_url, '/').'/';
$img_filename = $now.'.jpg';
imagejpeg($im, $img_path.$img_filename);
$img = '<img class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="'.$img_url.$img_filename.'" style="width: '.$img_width.'; height: '.$img_height .'; border: 0;" alt=" " />';
// ImageDestroy($im);
// return array('word' => $word, 'time' => $now, 'image' => $img, 'filename' => $img_filename);
// echo $img;
//通知浏览器是png格式
header('Content-type:image/jpg');
//以png格式输出
imagejpeg($im);
//销毁内存中的图片资源
imagedestroy($im);
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