63 lines
1.9 KiB
PHP
63 lines
1.9 KiB
PHP
<?php
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session_start(); //设置session
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require __DIR__ . "/function.php";
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//创建背景画布
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$img_w = 305;
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/*宽*/
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$img_h = 54;
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$img = imagecreatetruecolor($img_w, $img_h);
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$bg_color = imagecolorallocate($img, 0xcc, 0xcc, 0xcc);
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imagefill($img, 0, 0, $bg_color);
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//生成验证码
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$count = 4;
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$code = "";
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/*生成的验证码内容范围*/
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$charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
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$str_len = strlen($charset) - 1;
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/*for循环打印输出验证码*/
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for ($i = 0; $i < $count; $i++) {
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$code .= $charset[rand(0, $str_len)];
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}
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/*strtolower函数将输入的验证码自动转换为小写，用户不需要特意区分大小写*/
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$_SESSION['code'] = strtolower($code);
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/*字体大小*/
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$font_size = 24;
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/*字体文件位置*/
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$fontfile = APP_ROOT . $config['textFont'];
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/* floor() 修复php>8.0精度丢失 v2.8.4 */
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for ($i = 0; $i < $count; $i++) {
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$font_color = imagecolorallocate($img, mt_rand(0, 100), mt_rand(0, 50), mt_rand(0, 255));
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imagettftext(
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$img,
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$font_size,
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floor(mt_rand(0, 20) - mt_rand(0, 25)),
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floor($img_w * $i / 4) + floor(mt_rand(0, 15)),
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floor(mt_rand($img_h / 2, $img_h)),
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$font_color,
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realpath($fontfile),
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$code[$i]
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);
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}
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/*背景干扰点点*/
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for ($i = 0; $i < 300; $i++) {
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$color = imagecolorallocate($img, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
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imagesetpixel($img, mt_rand(0, $img_w), mt_rand(0, $img_h), $color);
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}
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/*干扰线条*/
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for ($i = 0; $i < 5; $i++) {
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$color = imagecolorallocate($img, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
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imageline($img, mt_rand(0, $img_w), 0, mt_rand(0, $img_h), $img_h, $color);
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imagesetpixel($img, mt_rand(0, $img_w), mt_rand(0, $img_h), $color);
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}
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// 因为有些浏览器，访问的content-type会是文本型，所以我们需要设置成图片的格式类型
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header("content-type:image/png");
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imagepng($img); //建立png函数
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imagedestroy($image);
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