//php等比例裁剪,或者指定宽高从中心裁剪 public function image_center_crop($source,$despath,$name, $width, $height=0) { if(!is_dir($despath)) { if(!mkdir($despath,0777,true)) { return array( 'code'=>'-2',"message"=>'错误0003,上传文件失败 ,请联系管理员' ); } } $target = $despath."/".$name; //if (!file_exists($source)) return false; /* 根据类型载入图像 */ switch (exif_imagetype($source)) { case IMAGETYPE_JPEG: $image = imagecreatefromjpeg($source); break; case IMAGETYPE_GIF: $image = imagecreatefromgif($source); break; case IMAGETYPE_PNG: $image = imagecreatefrompng($source); break; default : $image = imagecreatefromjpeg($source); } if (!isset($image)) return false; /* 获取图像尺寸信息 */ $source_w = imagesx($image); $source_h = imagesy($image); $target_w = $width; if(!$height){ $height = $source_h/$source_w * $width; } $target_h = $height; /* 计算裁剪宽度和高度 */ $judge = (($source_w / $source_h) > ($target_w / $target_h)); $resize_w = $judge ? ($source_w * $target_h) / $source_h : $target_w; $resize_h = !$judge ? ($source_h * $target_w) / $source_w : $target_h; $start_x = $judge ? ($resize_w - $target_w) / 2 : 0; $start_y = !$judge ? ($resize_h - $target_h) / 2 : 0; /* 绘制居中缩放图像 */ $resize_img = imagecreatetruecolor($resize_w, $resize_h); imagecopyresampled($resize_img, $image, 0, 0, 0, 0, $resize_w, $resize_h, $source_w, $source_h); $target_img = imagecreatetruecolor($target_w, $target_h); imagecopy($target_img, $resize_img, 0, 0, $start_x, $start_y, $resize_w, $resize_h); /* 将图片保存至文件 */ //if (!file_exists(dirname($target))) mkdir(dirname($target), 0777, true); switch (exif_imagetype($source)) { case IMAGETYPE_JPEG: $target .= ".jpg"; imagejpeg($target_img, $target); break; case IMAGETYPE_PNG: $target .= ".png"; imagepng($target_img, $target); break; case IMAGETYPE_GIF: $target .= ".gif"; imagegif($target_img, $target); break; default : $target .= ".jpg"; imagejpeg($target_img, $target); } return array( 'code'=>'1','message'=>$target ); }
php 图片裁剪
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转载自blog.csdn.net/sinat_14826983/article/details/82052293
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