How to implement invariant cropping of images and proportional cropping of images in PHP, _PHP tutorial

How to implement image invariant cropping and image proportional cropping in PHP,

This article describes the example of PHP implementing image invariant cropping and image proportional cropping. Share it with everyone for your reference, the details are as follows:

Image invariant cropping

<&#63;php
/**
 * imageCropper
 * @param string $source_path
 * @param string $target_width
 * @param string $target_height
 */
function imageCropper($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 / $target_width;
  if ($source_ratio > $target_ratio){
    // image-to-height
    $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){
    //image-to-widht
    $cropped_width = $source_height / $target_ratio;
    $cropped_height = $source_height;
    $source_x = ($source_width - $cropped_width) / 2;
    $source_y = 0;
  }else{
    //image-size-ok
    $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 ;
      break;
  }
  $target_image = imagecreatetruecolor($target_width, $target_height);
  $cropped_image = imagecreatetruecolor($cropped_width, $cropped_height);
  // copy
  imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height);
  // zoom
  imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height);
  header('Content-Type: image/jpeg');
  imagejpeg($target_image);
  imagedestroy($source_image);
  imagedestroy($target_image);
  imagedestroy($cropped_image);
}
$filename = "8fcb7a0831b79c61.jpg";
imageCropper($filename,200,200);
&#63;>

The picture is cropped proportionally

<&#63;php
/**
 * imageZoom
 * @param string $file
 * @param double $zoom
 */
function imageZoom($filename,$zoom=0.6){
  //baseinfo
  $sourceImageInfo = getimagesize($filename);
  $sourceWidth = $sourceImageInfo[0];
  $sourceHeight = $sourceImageInfo[1];
  $sourceMine = $sourceImageInfo['mime'];
  $sourceRatio = $sourceWidth/$sourceHeight;
  $sourceX = 0;
  $sourceY = 0;
  //zoom
  $targetRatio = $zoom;
  //target-widht-height
  $targetWidth = $sourceWidth*$targetRatio;
  $targetHeight = $sourceHeight*$targetRatio;
  //init-params
  $sourceImage = null;
  switch($sourceMine){
    case 'image/gif':
      $sourceImage = imagecreatefromgif($filename);
      break;
    case 'image/jpeg':
      $sourceImage = imagecreatefromjpeg($filename);
      break;
    case 'image/png':
      $sourceImage = imagecreatefrompng($filename);
      break;
    default:
      return ;
      break;
  }
  //temp-target-image
  $tempSourceImage = imagecreatetruecolor($sourceWidth, $sourceHeight);
  $targetImage = imagecreatetruecolor($targetWidth,$targetHeight);
  //copy
  imagecopy($tempSourceImage, $sourceImage, 0, 0, $sourceX, $sourceY, $sourceWidth, $sourceHeight);
  //zoom
  imagecopyresampled($targetImage, $tempSourceImage, 0, 0, 0, 0, $targetWidth, $targetHeight, $sourceWidth, $sourceHeight);
  //header
  header('Content-Type: image/jpeg');
  //image-loading
  imagejpeg($targetImage);
  //destroy
  imagedestroy($tempSourceImage);
  imagedestroy($sourceImage);
  imagedestroy($targetImage);
}
$filename = "8fcb7a0831b79c61.jpg";
imageZoom($filename);
&#63;>

I hope this article will be helpful to everyone in PHP programming.

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