使用PHP和jQuery旋转图像并将其保存到目标文件夹

Question

It's not a question its about to share knowledge with millions of brothers like me. I've been working since few hours to rotate an image using PHP and jquery and replace image dynamically.This example will illustrate you more.

This example is based on Cakephp 2.5. So don't be panic. My Dom looks like

<div class="review-col campaign_image_upload_section">
    <?php
     echo $this->Campaign->image($campaign, 200, 200, true);
    ?>
</div>

In Html it returns like

<img alt="" src="http://192.168.100.96/XXX/XXX/XXX/files/timthumb.php?src=http://192.168.100.96/XXX/XXX/XXX/app/webroot/files/campaign/image/14/lost_home.jpg&amp;q=95&amp;w=200">

I've bound an jQuery event on rotate link. You could use simple html link with the roate_right class name. Event is bind on "rotate_right" class. My AJAX request looks like

$(".rotate_right").click(function (event) {
            event.preventDefault();
            $(".campaign_image_upload_section").html(loading());
            $.ajax({
                url: $(this).attr('href'),
                type: "POST",
                dataType: 'json',
                success: function (res) {
                    if (res.status) {
                        //You only could replace image src too
                        $(".campaign_image_upload_section").html("<img src='"+decodeURIComponent(res.src)+"' width=200 height=200>");
                    }
                    else {
                        alert("error in rotating");
                    }

                }
            });
            return false;
        })

In jQuery's loading function I am only showing a loading image to particular div. My PHP function which is being called looks like

public function rotate_image_right() {
        // File and rotation
        //You could use $_GET or pass parameters to this function

        $filename = $this->params->query('image');

        //PHP's imagerotate function will rotate counter clock wise. If you give 90 degree it will rotate left. use 270 to rotate on time    

        $degrees = 270;

// Content type - (uncomment below line to show out put in the browser)
//        header('Content-type: image/jpeg');
// Load
        $source = imagecreatefromjpeg($filename);

// Rotate
        $rotate = imagerotate($source, $degrees, 0);


        //I am fetching my campaign because to set directory path.
        $campaign = $this->Campaign->getData($this->params->query('id'));
// Output

        //Set current file name
        $cur_file = $this->params->query('image_name');

        $path_info = pathinfo($cur_file);

        strtolower($path_info['extension']);

        try{
        if ($path_info['extension'] == 'jpg' || $path_info['extension'] == 'jpeg') {
            $function = 'imagejpeg';
        } else {
            $function = 'image' . $path_info['extension'];
        }
        {catch (Exception $e) {
         // Handle invalid file
        }

        //My output directory - You change according to your uses
        $output_dir = WWW_ROOT . "files/campaign/image/" . $campaign["Campaign"]["id"] . "/";

        $function($rotate, $output_dir . $cur_file);

        imagedestroy($rotate);

        $response["status"] = true;
        $response["src"] = urlencode(Router::url("/", true) . 'files/campaign/image/' . $campaign["Campaign"]["id"] . '/' . $cur_file);

        //We must encode first to send back data to AJAX
        echo json_encode($response);
        exit;
    }

Finally My call of this code is below

<?php echo $this->Html->link("Rotate", array("controller" => "campaigns", "action" => "rotate_image_right?image=" . WWW_ROOT . "files/campaign/image/" . $campaign["Campaign"]["id"] . "/" . $campaign["Campaign"]["image"] . "&id=" . $campaign["Campaign"]["id"] . "&image_name=" . $campaign["Campaign"]["image"]), array("class" => "rotate_right")); ?>

Answer 1

Just a guess (there's a lot of code there, generally we like it if askers can isolate the problem code to +- 10 lines), but I think you're missing

// Output
imagejpeg($rotate);

as suggested in the PHP docs for imagerotate.

And the docs on imagejpeg to explain how that function works (I believe you'd pass the filename as the second parameter).