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php怎么实现文件缩略图

藏色散人

Jul 14, 2021 am 09:52 AM

php

php实现文件缩略图的方法：首先创建一个PHP示例文件；然后通过“if ($_REQUEST['action']=="add"){...}if ($userfile_size>102400){...}”方法实现从上传文件创建缩略图即可。

php怎么实现文件缩略图

本文操作环境：windows7系统、PHP7.1版，DELL G3电脑

php怎么实现文件缩略图？

php实现从上传文件创建缩略图的方法

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：

<?php
if ($_REQUEST[&#39;action&#39;]=="add"){
$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>102400){
   $error=1;
   $msg = "The photo is over 100kb. Please try again.";
}
////////////////////////////////
// CHECK TYPE (IE AND OTHERS) //
if ($userfile_type="image/pjpeg"){
  if ($userfile_type!="image/jpeg"){
    $error=1;
    $msg = "The photo must be JPG";
  }
}
//////////////////////////////
//CHECK WIDTH/HEIGHT //
if ($large_width!=600 or$large_height!=400){
$error=1;
$msg = "The photo must be 600x400 pixels";
}
///////////////////////////////////////////
//CREATE THUMB / UPLOAD THUMB AND PHOTO ///
if ($error<>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,"path/to/folder/to/upload/thumb".$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,"path/to/folder/to/upload/photo".$userfile_name, 100))
   {}
      else {$msg="A problem has occured. Please try again."; $error=1;}
  }
  else {
   $msg="A problem has occured. Please try again."; $error=1;
  }
}
//////////////////////////////////////////////
/// If everything went right a photo (600x400) and
/// a thumb(120x90) were uploaded to the given folders
}
?>
<html><head><title>create thumb</title></head>
<body>
<form name="form1" enctype="multipart/form-data" action="thisfile.php?action=add" method="post">
Select Photo: <input type="file" name="photo">
<input type="submit" name="submit" value="CREATE THUMB AND UPLOAD">
</form>
</body
</html>

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