php 图片裁剪保存,PHP实现上传裁剪图片

本文主要和大家分享PHP实现上传裁剪图片，主要以代码的形式和大家分享，希望能帮助到大家。/ 图片裁剪上传

// $source_path = 'E:wwwcylxshstorageapp\'.$url; // 原图路径

$source_path = storage_path('app\'.$url); // 原图路径

$target_width = 1000; // 目标宽度

$target_height = 100; // 目标高度

$source_info = getimagesize($source_path); //获取图像信息

$source_width = $source_info[0]; //原图宽度

$source_height = $source_info[1]; // 原图高度

$source_mime = $source_info['mime']; // 文件类型

$source_ratio = $source_height / $source_width; // 原图比例

$target_ratio = $target_height / $target_width; // 目标比例

// 源图过高

if ($source_ratio > $target_ratio)

{

$cropped_width = $source_width; // 裁剪的宽度

$cropped_height = $source_width * $target_ratio; // 裁剪的高度

$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);

// 设置随机的文件名

$chars=null;

$len = 50;

if (is_null($chars)) {

$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

}

mt_srand(10000000*(double)microtime());

for ($i = 0, $fileName = '', $lc = strlen($chars)-1; $i < $len; $i++) {

$fileName .= $chars[mt_rand(0, $lc)];

}

//保存图片到本地

$res = imagepng($target_image,storage_path('appuploads\'.date('Y').'\'.date('m').'\'.date('d').'\'.$fileName));

if ($res == true){

unlink(storage_path('app\'.$url));

$url = storage_path('appuploads\'.date('Y').'\'.date('m').'\'.date('d').'\'.$fileName);

}else{

return view("Alert",["msg"=>"图片上传失败"]);

}

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