在学习php过程中会遇到图像处理的情况,本篇将会介绍图像处理的方法。
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<?php // 图片处理gd2配置文件修改 ?> <!-- 用图片处理函数画一张图 --> <?php // $img = imagecreatetruecolor(500, 500); // $red = imagecolorallocate($img, 255, 0, 0); // $green = imagecolorallocate($img, 0, 255, 0); // $blue = imagecolorallocate($img, 0, 0, 255); // $pur = imagecolorallocate($img, 255, 0, 255); // $yellow = imagecolorallocate($img, 121, 72, 0); // imagefilledrectangle($img, 0, 0, 500, 500, $green); // imageline($img, 0, 0, 500, 500, $red); // imageline($img, 500, 0, 0, 500, $blue); // imagefilledellipse($img, 250, 250, 200, 200, $yellow); // imagefilledellipse($img, 200, 200, 300, 300, $blue); // imagejpeg($img, 'haha.jpg'); // echo "<img src='haha.jpg'>"; // imagedestroy($img); ?> <!-- 开发验证码(生成验证码) --> <?php check_code(); function check_code($width = 100, $height = 50, $num = 4, $type = 'jpeg'){ $img = imagecreate($width, $height); $string = ''; for ($i = 0;$i < $num; $i++){ $rand = mt_rand(0, 2); switch ($rand) { case 0: $ascii = mt_rand(48, 57); break; case 1: $ascii = mt_rand(65, 90); break; case 2: $ascii = mt_rand(97, 122); break; } $string .= sprintf('%c', $ascii); } imagefilledrectangle($img, 0, 0, $width, $height, randBg($img)); for ($i = 0;$i < 50; $i++){ imagesetpixel($img, mt_rand(0, $width), mt_rand(0, $height), randPix($img)); } for ($i = 0;$i < $num;$i++){ $x = floor($width/$num) * $i + 2; $y = mt_rand(0, $height - 15); imagechar($img, 5, $x, $y, $string[$i], randPix($img)); } $func = 'image' . $type; $header = 'Content-type:image/'.$type; if (function_exists($func)) { header($header); $func($img); }else { echo '图片类型不支持'; } imagedestroy($img); return $string; } function randBg($img){ return imagecolorallocate($img, mt_rand(130, 255), mt_rand(130, 255), mt_rand(130, 255)); } function randPix($img){ return imagecolorallocate($img, mt_rand(0, 120), mt_rand(0, 120), mt_rand(0, 120)); } ?> <!-- 图像缩放和剪裁技术 --> <?php $image = imagecreatefrompng('fbb.png'); $percent = 0.1; list($width, $height) = getimagesize('fbb.png'); $new_width = $width * $percent; $new_height = $height * $percent; $new_image = imagecreatetruecolor($new_width, $new_height); imagecopyresampled($new_image, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height); header('content-type:image/jpeg'); imagejpeg($new_image); ?> <!-- 图片水印处理 --> <?php $dst = imagecreatefrompng('https://img.php.cn/upload/course/000/ 000/002/5833ebba648cf229.png'); $src = imagecreatefrompng('https://img.php.cn/ upload/course/000/000/002/5833ebe90cc11285.png'); $dst_info = getimagesize('5833ebba648cf229.png'); $src_info = getimagesize('5833ebe90cc11285.png'); $dst_x = $dst_info[0] - $src_info[0]; $dst_y = $dst_info[1] - $src_info[1]; imagecopymerge($dst, $src, $dst_x, $dst_y, 0, 0, $src_info[0], $src_info[1], 100); header('Content-type:image/png'); imagepng($dst); imagedestroy($dst); imagedestroy($src); ?> <!-- 做一个智能的图片水印函数 --> <?php ?>
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