php 图片剪切

 <?php

 /**
  * 图像裁剪
  * @param $source_path 原图路径
  * @param $target_width 需要裁剪的宽
  * @param $target_height 需要裁剪的高
  * @return bool
  */
 function imagecropper($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;
     }
     $funcList = array(
         'image/gif'  => array(
             'create' => 'imagecreatefromgif',
             'make'   => 'imagegif',
             'mime'   => '.gif',
         ),
         'image/jpeg' => array(
             'create' => 'imagecreatefromjpeg',
             'make'   => 'imagejpeg',
             'mime'   => '.jpg',
         ),
         'image/png'  => array(
             'create' => 'imagecreatefrompng',
             'make'   => 'imagepng',
             'mime'   => '.png',
         ),
     );
     if (isset($funcList[$source_mime])) {
         $curFunc = $funcList[$source_mime];
     } else {
         return FALSE;
     }
     $source_image = $curFunc['create']($source_path);

     $target_image  = imagecreatetruecolor($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";
     $fileName = time() . '_' . substr(md5($randNumber), 8, 16) . $curFunc['mime'];
     //imagepng($target_image, './' . $fileName);
     //imagepng($target_image, './' . $fileName);
     //$imgFunc2($target_image, './' . $fileName);
     $curFunc['make']($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('./4.jpg', 140, 140);
 //imagecropper('./img033.jpg',55,55);
 ?>

<?php

/**
* 图像裁剪
* @param $source_path 原图路径
* @param $target_width 需要裁剪的宽
* @param $target_height 需要裁剪的高
* @return bool
*/
function imagecropper($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;
}
$funcList = array(
'image/gif' => array(
'create' => 'imagecreatefromgif',
'make' => 'imagegif',
'mime' => '.gif',
),
'image/jpeg' => array(
'create' => 'imagecreatefromjpeg',
'make' => 'imagejpeg',
'mime' => '.jpg',
),
'image/png' => array(
'create' => 'imagecreatefrompng',
'make' => 'imagepng',
'mime' => '.png',
),
);
if (isset($funcList[$source_mime])) {
$curFunc = $funcList[$source_mime];
} else {
return FALSE;
}
$source_image = $curFunc['create']($source_path);

$target_image = imagecreatetruecolor($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";
$fileName = time() . '_' . substr(md5($randNumber), 8, 16) . $curFunc['mime'];
//imagepng($target_image, './' . $fileName);
//imagepng($target_image, './' . $fileName);
//$imgFunc2($target_image, './' . $fileName);
$curFunc['make']($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('./4.jpg', 140, 140);
//imagecropper('./img033.jpg',55,55);
?>