PbootCms缩略图裁剪优化居中裁剪（直接上干货）

// 剪切图片function cut_img($src_image, $out_image = null, int $new_width = null, int $new_height = null, $img_quality = 90){ // 输出地址 if (! $out_image) $out_image = $src_image; // 读取配置文件设置 if (! $new_width && ! $new_height) return; // 获取图片属性 list ($width, $height, $type, $attr) = getimagesize($src_image); switch ($type) { case 1: $img = imagecreatefromgif($src_image); break; case 2: $img = imagecreatefromjpeg($src_image); break; case 3: $img = imagecreatefrompng($src_image); break; } // 不限定是等比例缩放 if (! $new_width) { $new_width = floor($width * ($new_height / $height)); } if (! $new_height) { $new_height = floor($height * ($new_width / $width)); } // 创建画布 $new_img = imagecreatetruecolor($new_width, $new_height); // 创建透明画布,避免黑色 if ($type == 1 || $type == 3) { $color = imagecolorallocate($new_img, 255, 255, 255); imagefill($new_img, 0, 0, $color); imagecolortransparent($new_img, $color); } // 先缩放 $scale = max($new_width / $width, $new_height / $height); $scale_width = floor($scale * $width); $scale_height = floor($scale * $height); $scale_img = imagecreatetruecolor($scale_width, $scale_height); // 创建画布 if(function_exists("ImageCopyResampled")) { imagecopyresampled($scale_img, $img, 0, 0, 0, 0, $scale_width, $scale_height, $width, $height); } else { imagecopyresized($scale_img, $img, 0, 0, 0, 0, $scale_width, $scale_height, $width, $height); } //再裁剪 $start_x = ($scale_width - $new_width) / 2; $start_y = ($scale_height - $new_height) / 2; //拷贝剪切的图像数据到画板，生成剪切图像 imagecopy($new_img, $scale_img, 0, 0, $start_x, $start_y, $scale_width, $scale_height); check_dir(dirname($out_image), true); // 检查输出目录 switch ($type) { case 1: imagegif($new_img, $out_image, $img_quality); break; case 2: imagejpeg($new_img, $out_image, $img_quality); break; case 3: imagepng($new_img, $out_image, $img_quality / 10); // $quality参数取值范围0-99 在php 5.1.2之后变更为0-9 break; default: imagejpeg($new_img, $out_image, $img_quality); } imagedestroy($new_img); imagedestroy($img); return true;}

{pboot:list scode=*}<a href= "[list:link]"><img src="[list:ico width=600 height=400]" /></a>{/pboot:list}