How to operate uploaded files and images in php-PHP Tutorial-php.cn

How to operate uploaded files and images in php

墨辰丷

Release： 2023-03-31 16:16:01

Original

1415 people have browsed it

This article mainly introduces the method of creating thumbnails from uploaded files in PHP. It involves the skills of PHP operating uploaded files and image operations. It has certain reference value. Friends in need can refer to this article.

The example describes the method of creating thumbnails from uploaded files in PHP. The specific implementation method is as follows:

<?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>

Copy after login

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's learning.

Related recommendations:

php implements news release system

php operates image size modification and watermarking , generate verification code, output and save

php function to query songs through the Sina music library search interface

The above is the detailed content of How to operate uploaded files and images in php. For more information, please follow other related articles on the PHP Chinese website!