PHP：如何在上传后使用 getimageresized 调整图像大小后使用 getimgasize()？

Question

使用http://www.php.net/manual/en/function.imagecopyresized.php 给出的示例...之后如何使用getimagesize() 函数获取图像大小？

代码：

    <?php

        if(isset($_FILES['images'])){
         //TEST1:
          $img = resize_this_image_now($_FILES['images']['tmp_name']);


         //TEST2:
        $img = resize_this_image_now($_FILES['images']['name']);/// This Drastically failed.

          $new_image = getimagesize($img);

        var_dump($new_image[0]);// I guessed this should have printed out the WIDTH_OF_THE_IMAGE... but, it prints some NON_READABLE stuffs (why?)

    }

// The PHP.NET CODE in a Function

    function resize_this_image_now($filename){
        // File and new size
      //  $filename = 'test.jpg';

        $percent = 0.5;

        // Content type
        header('Content-Type: image/jpeg');

        // Get new sizes
        list($width, $height) = getimagesize($filename);
        $newwidth = $width * $percent;
        $newheight = $height * $percent;

        // Load
        $thumb = imagecreatetruecolor($newwidth, $newheight);
        $source = imagecreatefromjpeg($filename);

        // Resize
        imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

        // Output
    return    imagejpeg($thumb);
    }
        ?>

我想要的只是是得到Image....的Size 还有，是否有可能做类似的事情：

$_FILES['images']['tmp_name'] = $the_newly_resized_image_returned_from_the_PHP_dot_NET_code'; .... 这样['images']['tmp_name'] 现在将拥有此新图像的源？？

非常感谢任何建议...

Answer 1

我决定花一些时间检查你的问题。我发现，我认为您不需要像您那样通过imagejpeg() 调整大小的图像return。您可能还需要添加一个imagedestroy()，在您在function 中调用imagejpeg() 后，以销毁使用的临时内存。

您需要先完全上传图片，然后再调整其大小。如果你愿意，你可以在做任何你想做的事情时将图像发送到临时存储中，这样 PHP 就不必以 'tmp_name' 格式处理它......然后你可以稍后销毁图像.

图像完全上传后，事情就变得容易了。代码可能类似于：

        if(isset($_FILES['images'])){

        //may be some random numbers to accompany it.
        $rand = floor((mt_rand()+rand()+mt_rand())/3);

//Send it to the temporary folder you have had to create.
        if(move_uploaded_file(
                    $_FILES['images']['tmp_name'],'temporary_storage/image_'.$rand.'.jpg')){

        //Then run the `resize` function from here.
        $image_resized = resize_this_image_now('temporary_storage/image_'.$rand.'.jpg');

        //Now You can get the size if you wish.         
        list($width,$height) = getimagesize('temporary_storage/image_'.$rand.'.jpg');   

        // Out put

        echo "W:".$width."<br>H:".$height;

        //After you use it as desired, you can now destroy it using unlink or so.

unlink('temporary_storage/image_'.$rand.'.jpg');

            }else{
    echo "Upload Error goes here";
    }

        }

请注意，此答案是经过多次试验和错误后产生的...请明智地使用此策略。

希望对你有帮助。