PHP GD:如何获取图像数据作为二进制字符串? [英] PHP GD: How to get imagedata as binary string?

问题描述

我正在使用一种将图像文件组装为zip并将其流式传输到浏览器/Flex应用程序的解决方案. (Paul Duncan的ZipStream， http://pablotron.org/software/zipstream-php/ ).

I'm using a solution for assembling image files to a zip and streaming it to browser/Flex application. (ZipStream by Paul Duncan, http://pablotron.org/software/zipstream-php/).

只需加载图像文件并将其压缩即可正常工作.这是压缩文件的核心:

Just loading the image files and compressing them works fine. Here's the core for compressing a file:

// Reading the file and converting to string data
$stringdata = file_get_contents($imagefile);

// Compressing the string data
$zdata = gzdeflate($stringdata );

我的问题是我想在压缩之前使用GD处理图像.因此，我需要一种将图像数据(imagecreatefrompng)转换为字符串数据格式的解决方案:

My problem is that I want to process the image using GD before compressing it. Therefore I need a solution for converting the image data (imagecreatefrompng) to string data format:

// Reading the file as GD image data
$imagedata = imagecreatefrompng($imagefile);
// Do some GD processing: Adding watermarks etc. No problem here...

// HOW TO DO THIS??? 
// convert the $imagedata to $stringdata - PROBLEM!

// Compressing the string data
$zdata = gzdeflate($stringdata );

有任何线索吗?

推荐答案

一种方法是告诉GD输出图像，然后使用PHP缓冲将其捕获为字符串:

One way is to tell GD to output the image, then use PHP buffering to capture it to a string:

$imagedata = imagecreatefrompng($imagefile);
ob_start();
imagepng($imagedata);
$stringdata = ob_get_contents(); // read from buffer
ob_end_clean(); // delete buffer
$zdata = gzdeflate($stringdata);

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