php生成縮略圖的方法有哪些 php生成縮略圖的方法是什么

php生成縮略圖的方法有哪些 php生成縮略圖的方法是什么

日期:2023-03-08 16:48:03    编辑:网络投稿    来源:网络资源

PHP生成縮略圖的方法  PHP語法吸收了C語言、Java和Perl的特點,利于學習,使用廣泛,以下是為大家分享的PHP生成縮略圖的方法,供大家參考借鑒,歡迎瀏覽!  <?php  function get

PHP生成縮略圖的方法

  PHP語法吸收了C語言、Java和Perl的特點,利于學習,使用廣泛,以下是為大家分享的PHP生成縮略圖的方法,供大家參考借鑒,歡迎瀏覽!

  <?php

  function getCropper($source_path,$NewImagePath, $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;

  // 源圖過高

  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;

  }

  // 源圖過寬

  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;

  }

  // 源圖適中

  else

  {

  $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);

  // 圖片裁剪

  imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height);

  // 圖片縮放

  imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height);

  header('Content-Type: image/jpeg');

  imagejpeg($target_image,$NewImagePath,100);

  imagedestroy($source_image);

  imagedestroy($target_image);

  imagedestroy($cropped_image);

  }

  以下方法是生成縮略圖,填充白邊的`方法

  <?php

  //生成縮略圖,填充白邊

  function getCrops($src_path,$NewImagePath,$width,$height){

  //源圖對象

  $src_image = imagecreatefromstring(file_get_contents($src_path));

  $source_info = getimagesize($src_path);

  $source_mime = $source_info['mime'];

  $src_width = imagesx($src_image);

  $src_height = imagesy($src_image);

  switch ($source_mime)

  {

  case 'image/gif':

  $src_image = imagecreatefromgif($src_path);

  break;

  case 'image/jpeg':

  $src_image = imagecreatefromjpeg($src_path);

  break;

  case 'image/png':

  $src_image = imagecreatefrompng($src_path);

  break;

  default:

  return false;

  break;

  }

  //生成等比例的縮略圖

  //$tmp_image_width = 0;

  //$tmp_image_height = 0;

  if ($src_width / $src_height >= $width / $height) {

  $tmp_image_width = $width;

  $tmp_image_height = round($tmp_image_width * $src_height / $src_width);

  } else {

  $tmp_image_height = $height;

  $tmp_image_width = round($tmp_image_height * $src_width / $src_height);

  }

  $tmpImage = imagecreatetruecolor($tmp_image_width, $tmp_image_height);

  imagecopyresampled($tmpImage, $src_image, 0, 0, 0, 0, $tmp_image_width, $tmp_image_height, $src_width, $src_height);

  //添加白邊

  $final_image = imagecreatetruecolor($width, $height);

  $color = imagecolorallocate($final_image, 255, 255, 255);

  imagefill($final_image, 0, 0, $color);

  $x = round(($width - $tmp_image_width) / 2);

  $y = round(($height - $tmp_image_height) / 2);

  imagecopy($final_image, $tmpImage, $x, $y, 0, 0, $tmp_image_width, $tmp_image_height);

  //輸出圖片

  header('Content-Type: image/jpeg');

  imagejpeg($final_image,$NewImagePath,100);

  imagedestroy($src_image);

  imagedestroy($final_image);

  }

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