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php操作上传文件及图片操作的方法

Jun 11, 2018 pm 05:27 PM

php 上传文件

这篇文章主要介绍了php实现从上传文件创建缩略图的方法,涉及php操作上传文件及图片操作的技巧,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例讲述了php实现从上传文件创建缩略图的方法。具体实现方法如下：

&lt;?php
if ($_REQUEST[&#39;action&#39;]==&quot;add&quot;){
$userfile = $HTTP_POST_FILES[&#39;photo&#39;][&#39;tmp_name&#39;];
$userfile_name = $HTTP_POST_FILES[&#39;photo&#39;][&#39;name&#39;];
$userfile_size = $HTTP_POST_FILES[&#39;photo&#39;][&#39;size&#39;];
$userfile_type = $HTTP_POST_FILES[&#39;photo&#39;][&#39;type&#39;];
///////////////////////// 
//GET-DECLARE DIMENSIONS //
$dimension = getimagesize($userfile);
$large_width = $dimension[0]; // GET PHOTO WIDTH
$large_height = $dimension[1]; //GET PHOTO HEIGHT
$small_width = 120; // DECLARE THUMB WIDTH
$small_height = 90; // DECLARE THUMB HEIGHT
/////////////////////////
//CHECK SIZE //
if ($userfile_size&gt;102400){
   $error=1;
   $msg = &quot;The photo is over 100kb. Please try again.&quot;;
}
////////////////////////////////
// CHECK TYPE (IE AND OTHERS) //
if ($userfile_type=&quot;image/pjpeg&quot;){
  if ($userfile_type!=&quot;image/jpeg&quot;){
    $error=1;
    $msg = &quot;The photo must be JPG&quot;;
  }
}
//////////////////////////////
//CHECK WIDTH/HEIGHT //
if ($large_width!=600 or$large_height!=400){
$error=1;
$msg = &quot;The photo must be 600x400 pixels&quot;;
}
///////////////////////////////////////////
//CREATE THUMB / UPLOAD THUMB AND PHOTO ///
if ($error&lt;&gt;1){
  $image = $userfile_name; //if you want to insert it to the database
  $pic = imagecreatefromjpeg($userfile);
  $small = imagecreatetruecolor($small_width,$small_height);
  imagecopyresampled($small,$pic,0,0,0,0, $small_width, $small_height, $large_width, $large_height);
  if (imagejpeg($small,&quot;path/to/folder/to/upload/thumb&quot;.$userfile_name, 100)){  
    $large = imagecreatetruecolor($large_width,$large_height);
  imagecopyresampled($large,$pic,0,0,0,0, $large_width, $large_height, $large_width, $large_height);
    if (imagejpeg($large,&quot;path/to/folder/to/upload/photo&quot;.$userfile_name, 100))
   {}
      else {$msg=&quot;A problem has occured. Please try again.&quot;; $error=1;}
  }
  else {
   $msg=&quot;A problem has occured. Please try again.&quot;; $error=1;
  }
}
//////////////////////////////////////////////
/// If everything went right a photo (600x400) and
/// a thumb(120x90) were uploaded to the given folders
}
?&gt;
&lt;html&gt;&lt;head&gt;&lt;title&gt;create thumb&lt;/title&gt;&lt;/head&gt;
&lt;body&gt;
&lt;form name=&quot;form1&quot; enctype=&quot;multipart/form-data&quot; action=&quot;thisfile.php?action=add&quot; method=&quot;post&quot;&gt;
Select Photo: &lt;input type=&quot;file&quot; name=&quot;photo&quot;&gt;
&lt;input type=&quot;submit&quot; name=&quot;submit&quot; value=&quot;CREATE THUMB AND UPLOAD&quot;&gt;
&lt;/form&gt;
&lt;/body
&lt;/html&gt;

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