如何在PHP中调整图像大小

Question

 My Updated code /*$extension = pathinfo($_FILES['file']['name'], PATHINFO_EXTENSION); $path = $_FILES['file']['tmp_name']; $filename = file_get_contents($path);*/ /* $imgdata = base64_encode($im); // here we got base64 encode value $idproof = array("encode" => $imgdata, "path" =>$path, "extension" =>$extension, ); echo json_encode($idproof);*/ $image; $image_type; $width = 150; $height = 150; //----------------------------------------------- // Load Image file //----------------------------------------------- function load($filename) { global $image; global $image_type; $image_info = getimagesize($filename); $image_type = $image_info[2]; if($image_type == IMAGETYPE_JPEG) { $image = imagecreatefromjpeg($filename); } elseif($image_type == IMAGETYPE_GIF) { $image = imagecreatefromgif($filename); } elseif($image_type == IMAGETYPE_PNG) { $image = imagecreatefrompng($filename); } } //----------------------------------------------- // Save Image file //----------------------------------------------- function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) { global $image; global $image_type; if( $image_type == IMAGETYPE_JPEG ) { imagejpeg($image,$filename,$compression); } elseif( $image_type == IMAGETYPE_GIF ) { imagegif($image,$filename); } elseif( $image_type == IMAGETYPE_PNG ) { imagepng($image,$filename); } if( $permissions != null ) { chmod($filename,$permissions); } } //----------------------------------------------- // View Image file //----------------------------------------------- function output($image_type=IMAGETYPE_JPEG) { global $image; global $image_type; if( $image_type == IMAGETYPE_JPEG ) { imagejpeg($image); } elseif( $image_type == IMAGETYPE_GIF ) { imagegif($image); } elseif( $image_type == IMAGETYPE_PNG ) { imagepng($image); } } function getWidth() { global $image; return imagesx($image); } function getHeight() { global $image; return imagesy($image); } //============================================================================= // Resize Images //============================================================================= //----------------------------------------------- // Resize Images 01 - Resize to Height //----------------------------------------------- function resizeToHeight($height) { $ratio = $height / getHeight(); $width = getWidth() * $ratio; resize($width,$height); } //----------------------------------------------- // Resize Images 02 - Resize to Width //----------------------------------------------- function resizeToWidth($width) { $ratio = $width / getWidth(); $height = getheight() * $ratio; resize($width,$height); } //----------------------------------------------- // Resize Images 03 - Scale in % //----------------------------------------------- function scale($scale) { $width = getWidth() * $scale/100; $height = getheight() * $scale/100; resize($width,$height); } //----------------------------------------------- // Resize Images 04 - Scale in % //----------------------------------------------- function resize($width,$height) { global $image; $new_image = imagecreatetruecolor($width, $height); imagecopyresampled($new_image, $image, 0, 0, 0, 0, $width, $height, getWidth(), getHeight()); $image = $new_image; } load($_FILES['file']['tmp_name']); // To resize based on image width resizeToWidth($width); // To resize based on image height resizeToHeight($height); // To resize to specific size resize($width, $height) ; $filename = base64_encode(output()); $idproof = array("encode" => $filename, ); echo json_encode($idproof); 

I am doing one php file upload,in that field user uploads the large image means, i want to re size the image, see here i want like this ,but this code i can't understand,next after re size the image i want to encode that image how can do this one?

 <script type="text/javascript"> $("#idproof").submit(function(e) { var formData = new FormData(); var id = '<?php echo $id;?>'; formData.append('ssmid', id); formData.append('file', $('input[type=file]')[0].files[0]); $.ajax({ url: 'idproof_check.php', type: 'POST', data: formData, async: false, cache: false, contentType: false, processData: false, success: function (data) { var res=jQuery.parseJSON(data);// convert the json console.log(res); }, }); }); </script> idproof_check.php <?php $userid = $_POST['userid']; $extension = pathinfo($_FILES['file']['name'], PATHINFO_EXTENSION); $path = $_FILES['file']['tmp_name']; $im = file_get_contents($path); /*Here i want to resize the image after that i want to encode the image*/ $filename = base64_encode($im); // here we got base64 encoded value $idproof = array("encode" => $filename, "path" =>$path, "extension" =>$extension, ); echo json_encode($idproof); ?> 

  <form method="post" enctype="multipart/form-data" class="form-horizontal" id="idproof" name="myForm"> <div class="input-group heading1"> <span class="input-group-btn"> <span class="btn btn-primary btn-file"> Browse&hellip; <input type="file" id="myFile" name="file" > </span> </span> <input type="text" class="form-control" readonly=""> </div> <div class="row"> <div class="col-md-5 col-md-offset-2"> <div class="input-group heading1"> <span class="input-group-btn"> <button type="submit" class="btn btn-primary btn-md horoscope">Upload ID Proof</button> </div> </div> </div> </form> 

Answer 1

Here's the php class to resize images.

    <?php

    /*
    * File: SimpleImage.php
    * Author: Simon Jarvis
    * Copyright: 2006 Simon Jarvis
    * Date: 08/11/06
    * Link: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php
    *
    * This program is free software; you can redistribute it and/or
    * modify it under the terms of the GNU General Public License
    * as published by the Free Software Foundation; either version 2
    * of the License, or (at your option) any later version.
    *
    * This program is distributed in the hope that it will be useful,
    * but WITHOUT ANY WARRANTY; without even the implied warranty of
    * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    * GNU General Public License for more details:
    * http://www.gnu.org/licenses/gpl.html
    *
    */

   $image;
   $image_type;

   //-----------------------------------------------
   //   Load Image file
   //-----------------------------------------------
   function load($filename) 
   {
       global $image;
       global $image_type;

            $image_info = getimagesize($filename);
            $image_type = $image_info[2];
            if($image_type == IMAGETYPE_JPEG) 
            {
                $image = imagecreatefromjpeg($filename);
            } 
            elseif($image_type == IMAGETYPE_GIF) 
            {
                $image = imagecreatefromgif($filename);
            }
            elseif($image_type == IMAGETYPE_PNG) 
            {
                $image = imagecreatefrompng($filename);
            }
   }

   //-----------------------------------------------
   //   Save Image file
   //-----------------------------------------------
   function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null)
   {
       global $image;
       global $image_type;

            if( $image_type == IMAGETYPE_JPEG ) 
            {
                imagejpeg($image,$filename,$compression);
            }
            elseif( $image_type == IMAGETYPE_GIF )
            {
                imagegif($image,$filename);
            } 
            elseif( $image_type == IMAGETYPE_PNG )
            {
                imagepng($image,$filename);
            }
            if( $permissions != null ) 
            {
                chmod($filename,$permissions);
            }
   }

   //-----------------------------------------------
   //   View Image file
   //-----------------------------------------------
   function output($image_type=IMAGETYPE_JPEG) 
   {
      global $image;
      global $image_type;

      if( $image_type == IMAGETYPE_JPEG )
      {
         imagejpeg($image);
      } 
      elseif( $image_type == IMAGETYPE_GIF )
      {
         imagegif($image);
      } elseif( $image_type == IMAGETYPE_PNG ) 
      {
         imagepng($image);
      }
   }

   function getWidth() 
   {
      global $image;
      return imagesx($image);
   }
   function getHeight() 
   {
      global $image;
      return imagesy($image);
   }

   //=============================================================================
   //   Resize Images
   //=============================================================================

   //-----------------------------------------------
   //   Resize Images 01 - Resize to Height
   //-----------------------------------------------
   function resizeToHeight($height) 
   {
      $ratio = $height / getHeight();
      $width = getWidth() * $ratio;
      resize($width,$height);
   }

   //-----------------------------------------------
   //   Resize Images 02 - Resize to Width
   //-----------------------------------------------
   function resizeToWidth($width) 
   {
      $ratio = $width / getWidth();
      $height = getheight() * $ratio;
      resize($width,$height);
   }

   //-----------------------------------------------
   //   Resize Images 03 - Scale in %
   //-----------------------------------------------
   function scale($scale) 
   {
      $width = getWidth() * $scale/100;
      $height = getheight() * $scale/100;
      resize($width,$height);
   }

   //-----------------------------------------------
   //   Resize Images 04 - Scale in %
   //-----------------------------------------------
   function resize($width,$height) 
   {
      global $image;

      $new_image = imagecreatetruecolor($width, $height);
      imagecopyresampled($new_image, $image, 0, 0, 0, 0, $width, $height, getWidth(), getHeight());
      $image = $new_image;
   }      
    ?>

Call this class using:

load($_FILES["IMAGE_FILE"]["tmp_name"]);

// To resize based on image width
resizeToWidth($width); 

// To resize based on image height
resizeToHeight($height); 

// To resize to specific size
resize($width, $height) 

// To save file in web server directory
save($PATH);

// To retrieve resized images directly from variable
output();

EDIT: You don't need echo to make a function call.

$width = 150;
$height = 150;
load($_FILES['file']['tmp_name']);

// To resize to specific size
resize($width, $height) 

$filename = base64_encode(output());

Answer 2

Call this function where you insert your image

<?php
function make_thumb($src, $dest, $desired_width, $desired_height) {

    /* read the source image */
    $source_image = imagecreatefromjpeg($src);
    $width = imagesx($source_image);
    $height = imagesy($source_image);
    /*if($width <600){
    $desired_width = $width;    
    }*/

    /* find the "desired height" of this thumbnail, relative to the desired width  */


    /* create a new, "virtual" image */
    $virtual_image = imagecreatetruecolor($desired_width, $desired_height);

    /* copy source image at a resized size */
    imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height);

    /* create the physical thumbnail image to its destination */
    imagejpeg($virtual_image, $dest);
}


    $src = "../../gallery_image/$file_name";
    $dest = "../../gallery_image/thumb/$file_name";
    $desired_width = "360";
    $desired_height = "260";
    make_thumb($src, $dest, $desired_width, $desired_height);

?>