Resize images in PHP without using third-party libraries? -

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in 1 of applications, i'm using code snippet below copy uploaded images directory. works fine copying large images (> 2mb) takes more time ideal , don't need images big, so, i'm looking way resize images. how achieve using php?

<?php  $uploaddirectory = 'images/0001/'; $randomnumber = rand(0, 99999);  $filename = basename($_files['userfile']['name']); $filepath = $uploaddirectory.md5($randomnumber.$filename);  // check if file sent through http post.  if (is_uploaded_file($_files['userfile']['tmp_name']) == true) {      // validate file size, accept files under 5 mb (~5e+6 bytes).      if ($_files['userfile']['size'] <= 5000000) {          // move file path specified.          if (move_uploaded_file($_files['userfile']['tmp_name'], $filepath) == true) {              // ...          }      }  }  ?>

finally, i've discovered way fit needs. following snippet resize image specified width, automatically calculating height in order keep proportion.

$image = $_files["image"]["tmp_name"]; $resizeddestination = $uploaddirectory.md5($randomnumber.$filename)."_resized.jpg";  copy($_files, $resizeddestination);  $imagesize = getimagesize($image); $imagewidth = $imagesize[0]; $imageheight = $imagesize[1];  $desired_width = 100; $proportionalheight = round(($desired_width * $imageheight) / $imagewidth);  $originalimage = imagecreatefromjpeg($image);  $resizedimage = imagecreatetruecolor($desired_width, $proportionalheight);  imagecopyresampled($images_fin, $originalimage, 0, 0, 0, 0, $desired_width+1, $proportionalheight+1, $imagewidth, $imageheight); imagejpeg($resizedimage, $resizeddestination);  imagedestroy($originalimage); imagedestroy($resizedimage);

to else seeking complete example, create 2 files:

<!-- send.html -->  <html>  <head>      <title>simple file upload</title>  </head>  <body>      <center>          <div style="margin-top:50px; padding:20px; border:1px solid #cecece;">              select image.              <br/>             <br/>              <form action="receive.php" enctype="multipart/form-data" method="post">                 <input type="file" name="image" size="40">                 <input type="submit" value="send">             </form>          </div>      </center>  </body> 

<?php  // receive.php  $randomnumber = rand(0, 99999); $uploaddirectory = "images/"; $filename = basename($_files['file_contents']['name']); $destination = $uploaddirectory.md5($randomnumber.$filename).".jpg";  echo "file path:".$filepath."<br/>";  if (is_uploaded_file($_files["image"]["tmp_name"]) == true) {      echo "file received through http post.<br/>";      // validate file size, accept files under 5 mb (~5e+6 bytes).      if ($_files['image']['size'] <= 5000000) {          echo "file size: ".$_files["image"]["size"]." bytes.<br/>";          // resize , save image.          $image = $_files["image"]["tmp_name"];         $resizeddestination = $uploaddirectory.md5($randomnumber.$filename)."_resized.jpg";          copy($_files, $resizeddestination);          $imagesize = getimagesize($image);         $imagewidth = $imagesize[0];         $imageheight = $imagesize[1];          $desired_width = 100;         $proportionalheight = round(($desired_width * $imageheight) / $imagewidth);          $originalimage = imagecreatefromjpeg($image);          $resizedimage = imagecreatetruecolor($desired_width, $proportionalheight);          imagecopyresampled($images_fin, $originalimage, 0, 0, 0, 0, $desired_width+1, $proportionalheight+1, $imagewidth, $imageheight);         imagejpeg($resizedimage, $resizeddestination);          imagedestroy($originalimage);         imagedestroy($resizedimage);          // save original image.          if (move_uploaded_file($_files['image']['tmp_name'], $destination) == true) {              echo "copied original file specified destination.<br/>";          }      }  }  ?>

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