php实现从上传文件创建缩略图的方法

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php实现从上传文件创建缩略图的方法

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，分享给大家供大家参考，具体实现方法如下：

<?php

if ($_REQUEST['action']=="add"){

$userfile = $HTTP_POST_FILES['photo']['tmp_name'];

$userfile_name = $HTTP_POST_FILES['photo']['name'];

$userfile_size = $HTTP_POST_FILES['photo']['size'];

$userfile_type = $HTTP_POST_FILES['photo']['type'];

/////////////////////////

//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>

出处：http://www.phpfensi.com/php/20210520/15648.html

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