php裁剪图片
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php裁剪图片
<?php /** * 图像裁剪 * @param $title string 原图路径 * @param $content string 需要裁剪的宽 * @param $encode string 需要裁剪的高 */ function imagecropper($source_path, $target_width, $target_height) { $source_info = getimagesize($source_path); $source_width = $source_info[0]; $source_height = $source_info[1]; $source_mime = $source_info[‘mime‘]; $source_ratio = $source_height / $source_width; $target_ratio = $target_height / $target_width; // 源图过高 if ($source_ratio > $target_ratio) { $cropped_width = $source_width; $cropped_height = $source_width * $target_ratio; $source_x = 0; $source_y = ($source_height - $cropped_height) / 2; } // 源图过宽 elseif ($source_ratio < $target_ratio) { $cropped_width = $source_height / $target_ratio; $cropped_height = $source_height; $source_x = ($source_width - $cropped_width) / 2; $source_y = 0; } // 源图适中 else { $cropped_width = $source_width; $cropped_height = $source_height; $source_x = 0; $source_y = 0; } switch ($source_mime) { case ‘image/gif‘: $source_image = imagecreatefromgif($source_path); break; case ‘image/jpeg‘: $source_image = imagecreatefromjpeg($source_path); break; case ‘image/png‘: $source_image = imagecreatefrompng($source_path); break; default: return false; break; } $target_image = imagecreatetruecolor($target_width, $target_height); $cropped_image = imagecreatetruecolor($cropped_width, $cropped_height); // 裁剪 imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height); // 缩放 imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height); //保存图片到本地(两者选一) //$randNumber = mt_rand(00000, 99999). mt_rand(000, 999); //$fileName = substr(md5($randNumber), 8, 16) .".png"; //imagepng($target_image,‘./‘.$fileName); //imagedestroy($target_image); //直接在浏览器输出图片(两者选一) header(‘Content-Type: image/jpeg‘); imagepng($target_image); imagedestroy($target_image); imagejpeg($target_image); imagedestroy($source_image); imagedestroy($target_image); imagedestroy($cropped_image); } //调用 //imagecropper(‘./img033.jpg‘,300,300); imagecropper(‘./img033.jpg‘,140,140); //imagecropper(‘./img033.jpg‘,55,55);
php裁剪图片
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