PHP achieves constant image cropping and proportional Image cropping

: This article mainly introduces the PHP method for cropping images without changing the image type and cropping images proportionally. if you are interested in the PHP Tutorial, please refer to it. This article describes how PHP can crop images in a unchanged manner and scale according to the image. We will share this with you for your reference. The details are as follows:

Crop images unchanged

<?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);?>

Crop images proportionally

<?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);?>

I hope this article will help you with PHP programming.

The above introduces PHP's method of achieving constant image cropping and proportional Image cropping, including some content, and hope to be helpful to friends who are interested in PHP tutorials.