php等比例缩放图片及剪切图片代码分享，

/**
 * 图片缩放函数（可设置高度固定，宽度固定或者最大宽高，支持gif/jpg/png三种类型）
 * Author : Specs
 *
 * @param string $source_path 源图片
 * @param int $target_width 目标宽度
 * @param int $target_height 目标高度
 * @param string $fixed_orig 锁定宽高（可选参数 width、height或者空值）
 * @return string
 */
function myImageResize($source_path, $target_width = 200, $target_height = 200, $fixed_orig = ''){
  $source_info = getimagesize($source_path);
  $source_width = $source_info[0];
  $source_height = $source_info[1];
  $source_mime = $source_info['mime'];
  $ratio_orig = $source_width / $source_height;
  if ($fixed_orig == 'width'){
    //宽度固定
    $target_height = $target_width / $ratio_orig;
  }elseif ($fixed_orig == 'height'){
    //高度固定
    $target_width = $target_height * $ratio_orig;
  }else{
    //最大宽或最大高
    if ($target_width / $target_height > $ratio_orig){
      $target_width = $target_height * $ratio_orig;
    }else{
      $target_height = $target_width / $ratio_orig;
    }
  }
  switch ($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, $target_height);
  imagecopyresampled($target_image, $source_image, 0, 0, 0, 0, $target_width, $target_height, $source_width, $source_height);
  //header('Content-type: image/jpeg');
  $imgArr = explode('.', $source_path);
  $target_path = $imgArr[0] . '_new.' . $imgArr[1];
  imagejpeg($target_image, $target_path, 100);
}

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 - $cropped_height) / 2;
  }elseif ($source_ratio < $target_ratio){ // 源图过宽
    $cropped_width = $source_height / $target_ratio;
    $cropped_height = $source_height;
    $source_x = ($source_width - $cropped_width) / 2;
    $source_y = 0;
  }else{ // 源图适中
    $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);
  $dotpos = strrpos($source_path, '.');
  $imgName = substr($source_path, 0, $dotpos);
  $suffix = substr($source_path, $dotpos);
  $imgNew = $imgName . '_small' . $suffix;
  imagejpeg($target_image, $imgNew, 100);
  imagedestroy($source_image);
  imagedestroy($target_image);
  imagedestroy($cropped_image);
}