后端开发|php教程
php，生成验证码
后端开发-php教程
以下正文：
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新建一个PHP文件captcha_code_file.php
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//首先开启sessionsession_start();//定义前台显示验证码长&宽$image_width = 120;$image_height = 40;$characters_on_image = 6;$font = ./monofont.ttf;//The characters that can be used in the CAPTCHA code.//avoid confusing characters (l 1 and i for example)$possible_letters = 23456789bcdfghjkmnpqrstvwxyz;$random_dots = 10;$random_lines = 30;$captcha_text_color="0x142864";$captcha_noice_color = "0x142864";//定义要生成验证码的字符串$code = \;$i = 0;while ($i < $characters_on_image) { $code .= substr($possible_letters, mt_rand(0, strlen($possible_letters)-1), 1);$i++;}$font_size = $image_height * 0.75;$image = @imagecreate($image_width, $image_height);/* setting the background, text and noise colours here */$background_color = imagecolorallocate($image, 255, 255, 255);$arr_text_color = hexrgb($captcha_text_color);$text_color = imagecolorallocate($image, $arr_text_color[ ed], $arr_text_color[green], $arr_text_color[lue]);$arr_noice_color = hexrgb($captcha_noice_color);$image_noise_color = imagecolorallocate($image, $arr_noice_color[ ed], $arr_noice_color[green], $arr_noice_color[lue]);/* generating the dots randomly in background */for( $i=0; $i<$random_dots; $i++ ) {imagefilledellipse($image, mt_rand(0,$image_width), mt_rand(0,$image_height), 2, 3, $image_noise_color);}/* generating lines randomly in background of image */for( $i=0; $i 0xFF & ($int >> 0x10),"green" => 0xFF & ($int >> 0x8),"blue" => 0xFF & $int);}
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