Php调整大小与图像GD不显示图像，但调整大小

Question

我已经做了很多关于这个问题的搜索，仍然... 我有一个PHP代码来调整图像库Gd的大小，但麻烦的是，调整大小后它不显示图像。 这是代码

文件名resize.php

<?php 
/* 
* PHP function to resize an image maintaining aspect ratio 
* http://salman-w.blogspot.com/2008/10/resize-images-using-phpgd-library.html 
* 
* Creates a resized (e.g. thumbnail, small, medium, large) 
* version of an image file and saves it as another file 
*/ 

define('THUMBNAIL_IMAGE_MAX_WIDTH', 150); 
define('THUMBNAIL_IMAGE_MAX_HEIGHT', 150); 

function generate_image_thumbnail($source_image_path, $thumbnail_image_path) 
{ 
    list($source_image_width, $source_image_height, $source_image_type) = getimagesize($source_image_path); 
    switch ($source_image_type) { 
     case IMAGETYPE_GIF: 
      $source_gd_image = imagecreatefromgif($source_image_path); 
      break; 
     case IMAGETYPE_JPEG: 
      $source_gd_image = imagecreatefromjpeg($source_image_path); 
      break; 
     case IMAGETYPE_PNG: 
      $source_gd_image = imagecreatefrompng($source_image_path); 
      break; 
    } 
    if ($source_gd_image === false) { 
     return false; 
    } 
    $source_aspect_ratio = $source_image_width/$source_image_height; 
    $thumbnail_aspect_ratio = THUMBNAIL_IMAGE_MAX_WIDTH/THUMBNAIL_IMAGE_MAX_HEIGHT; 
    if ($source_image_width <= THUMBNAIL_IMAGE_MAX_WIDTH && $source_image_height <= THUMBNAIL_IMAGE_MAX_HEIGHT) { 
     $thumbnail_image_width = $source_image_width; 
     $thumbnail_image_height = $source_image_height; 
    } elseif ($thumbnail_aspect_ratio > $source_aspect_ratio) { 
     $thumbnail_image_width = (int) (THUMBNAIL_IMAGE_MAX_HEIGHT * $source_aspect_ratio); 
     $thumbnail_image_height = THUMBNAIL_IMAGE_MAX_HEIGHT; 
    } else { 
     $thumbnail_image_width = THUMBNAIL_IMAGE_MAX_WIDTH; 
     $thumbnail_image_height = (int) (THUMBNAIL_IMAGE_MAX_WIDTH/$source_aspect_ratio); 
    } 
    $thumbnail_gd_image = imagecreatetruecolor($thumbnail_image_width, $thumbnail_image_height); 
    imagecopyresampled($thumbnail_gd_image, $source_gd_image, 0, 0, 0, 0, $thumbnail_image_width, $thumbnail_image_height, $source_image_width, $source_image_height); 
    imagejpeg($thumbnail_gd_image, $thumbnail_image_path, 90); 
    imagedestroy($source_gd_image); 
    imagedestroy($thumbnail_gd_image); 
    return true; 
} 

generate_image_thumbnail('sql/max.jpg', 'sql/thumbnail_image_width_max.jpg'); 
?> 

而在index.php文件，我没有这样的事情

<img src="resize.php"/> 

麻烦的是，它调整图像大小，但它不显示它当我做<img src="resize.php"/>，但图像存在，如<img src="sql/thumbnail_image_width_max.jpg"/>存在。但是，如果没有做<img src="resize.php"/>我甚至不知道如何调整图像大小，这样我可以直接可能与<img src="sql/thumbnail_image_width_max.jpg"/>显示它或直接与<img src="resize.php"/>.

感谢您的帮助显示。并且希望这个时候我的问题不会再以负数标记。

Answer 1

让我来帮你。 该功能工作正常，所以，我认为你的问题在index.php。 在文件中加入：

include("resize.php"); //to include the function. 

然后调用函数，并检查是否工作正常。

$result=generate_image_thumbnail('sql/max.jpg', 'sql/thumbnail_image_width_max.jpg'); 

if($result) 
echo '<img src="sql/thumbnail_image_width_max.jpg"/>'; 
else 
echo "error in image function";