php crop image steps

<?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);

?>

<?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);

?>