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等比例生成缩略图的php程序

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Release: 2016-06-13 09:48:59
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等比例生成缩略图的php程序 这个程序很实现,但只是用来进来等比例生成缩略图哦,你要把文件上传到服务器,然后再由此函数来操作,有需要的朋友参考一下。

等比例生成缩略图的php教程程序
这个程序很实现,但只是用来进来等比例生成缩略图哦,你要把文件上传到服务器,然后再由此函数来操作,有需要的朋友参考一下。

function reSizeImg($imgSrc, $resize_width, $resize_height, $isCut=false) {
 //图片的类型
 $type = substr ( strrchr ( $imgSrc, "." ), 1 );
 //初始化图象
 if ($type == "jpg") {
  $im = imagecreatefromjpeg ( $imgSrc );
 }
 if ($type == "gif") {
  $im = imagecreatefromgif ( $imgSrc );
 }
 if ($type == "png") {
  $im = imagecreatefrompng ( $imgSrc );
 }
 //目标图象地址
 $full_length = strlen ( $imgSrc );
 $type_length = strlen ( $type );
 $name_length = $full_length - $type_length;
 $name = substr ( $imgSrc, 0, $name_length - 1 );
 $dstimg = $name . "_s." . $type;

 $width = imagesx ( $im );
 $height = imagesy ( $im );

 //生成图象
 //改变后的图象的比例
 $resize_ratio = ($resize_width) / ($resize_height);
 //实际图象的比例
 $ratio = ($width) / ($height);
 if (($isCut) == 1) //裁图
  {
  if ($ratio >= $resize_ratio) //高度优先
  {
   $newimg = imagecreatetruecolor ( $resize_width, $resize_height );
   imagecopyresampled ( $newimg, $im, 0, 0, 0, 0, $resize_width, $resize_height, (($height) * $resize_ratio), $height );
   ImageJpeg ( $newimg, $dstimg );
  }
  if ($ratio   {
   $newimg = imagecreatetruecolor ( $resize_width, $resize_height );
   imagecopyresampled ( $newimg, $im, 0, 0, 0, 0, $resize_width, $resize_height, $width, (($width) / $resize_ratio) );
   ImageJpeg ( $newimg, $dstimg );
  }
 } else //不裁图
 {
  if ($ratio >= $resize_ratio) {
   $newimg = imagecreatetruecolor ( $resize_width, ($resize_width) / $ratio );
   imagecopyresampled ( $newimg, $im, 0, 0, 0, 0, $resize_width, ($resize_width) / $ratio, $width, $height );
   ImageJpeg ( $newimg, $dstimg );
  }
  if ($ratio    $newimg = imagecreatetruecolor ( ($resize_height) * $ratio, $resize_height );
   imagecopyresampled ( $newimg, $im, 0, 0, 0, 0, ($resize_height) * $ratio, $resize_height, $width, $height );
   ImageJpeg ( $newimg, $dstimg );
  }
 }
 ImageDestroy ( $im );
}

调用方法简单,直接reSizeImg就可以了,参考很简单。

source:php.cn
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