標籤:php
自己寫驗證碼的時候在文字定位上拿捏不準
於是把ci驗證碼主要部分扣了出來,看看,一般般,幹擾線是亮點
代碼去除了很多判斷,簡化了很多,顯示效果一樣
<?php$defaults = array( ‘word‘ => ‘‘, ‘img_path‘ => ‘./‘, ‘img_url‘ => ‘‘, ‘img_width‘ => ‘150‘, ‘img_height‘ => ‘30‘, ‘font_path‘ => ‘./instance/font/Elephant.ttf‘, ‘expiration‘ => 7200, ‘word_length‘ => 4, ‘font_size‘ => 16, ‘img_id‘ => ‘‘, ‘pool‘ => ‘0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ‘, ‘colors‘ => array( ‘background‘ => array(255,255,255), ‘border‘ => array(153,102,102), ‘text‘ => array(204,153,153), ‘grid‘ => array(255,182,182) ));// 將變數從數組中取出foreach ($defaults as $key => $val){ $$key = $val;}// 產生隨機碼$word = ‘‘;$pool_length = strlen($pool);$rand_max = $pool_length - 1;for ($i = 0; $i < $word_length; $i++){ $word .= $pool[mt_rand(0, $rand_max)];}// 驗證碼長度$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, $img_height);// 建立圖片控制代碼$im = imagecreatetruecolor($img_width, $img_height);// 建立顏色foreach ($colors as $key => $values){ $colors[$key] = imagecolorallocate($im, $colors[$key][0], $colors[$key][1], $colors[$key][2]);}// 畫了個和圖片等大的矩形,就是背景ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $colors[‘background‘]);// -----------------幹擾線--------------------------$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 -= $thetac;}// --------------------------------------------------------------// 無字型// ($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);// }// 有字型// x 第一個字元隨機在圖片的前面一小段,後面依次加一個字元大小的寬度// y 圖片的1/2到距離底部3px之間隨機($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 += $font_size;}//畫矩形框imagerectangle($im, 0, 0, $img_width - 1, $img_height - 1, $colors[‘border‘]);// 刪除以前儲存的圖片$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);// 拼接檔案路徑並儲存$img_url = rtrim($img_url, ‘/‘).‘/‘;$img_filename = $now.‘.jpg‘;imagejpeg($im, $img_path.$img_filename);$img = ‘<img src="‘.$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 $img;//通知瀏覽器是png格式header(‘Content-type:image/jpg‘);//以png格式輸出imagejpeg($im);//銷毀記憶體中的圖片資源imagedestroy($im);
PHP碎碼——ci的驗證碼