PHP Data-URI到文件 [英] PHP Data-URI to file

问题描述

我有一个数据URI，我从JavaScript获得并尝试通过PHP保存。我使用下面的代码给出了一个明显的损坏的图像文件：

$ $ $ $ $ $ $ $ $; $ _POST ['logoImage'];

$ uri = substr（$ data，strpos（$ data，，）+ 1）;
$ b file_put_contents（$ _ POST ['logoFilename']，base64_decode（$ uri））;



数据：图像/ PNG; BASE64，iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs 9AAAACXBIWXMAAAsTAAALEwEAmpwYAAAAxklEQVQYlYWQMW7CUBBE33yITYUUmwbOkBtEcgUlTa7COXIVV5RUkXKC5AxU EdyZVD4kyKxkwIrr9vd0c7Oih aopinLNsF6Qkg2XW4XJ7LGFsAAcTV6lF5 / jLdbALA9XDAXYfthFQVx OrmqKYK88 / 7rbbMFksALieTnzu9wDYTj6f70PKsp2kwAiSvjXNcvkWpAfNZkzWa / 5a9yT7fdoX7rrB7hYh2fXo9HdjPYQZu3MIU8bYIlW20y0RUlXG2Kpv / vfwLxhTaSQwWqwhAAAAAElFTkSuQmCC

代码下面是实际的图像作为Data-URI。 'logoImage'是上面的字符串，$ uri是字符串减去'image / jpeg; base64'。

解决方案

在PHP手册中快速浏览会产生以下结果：

如果要保存从Javascript
canvas.toDataURL（）函数派生的数据，则必须将空格转换为加号。
如果不这样做，解码后的数据将被破坏：

 <？php 
 $ encodedData = str_replace（''，'+'，$ encodedData）; 
 $ decodedData = base64_decode（$ encodedData）; 
？> 
  

I have a data URI I am getting from javascript and trying to save via php. I use the following code which gives a apparently corrupt image file:

  $data = $_POST['logoImage'];

  $uri = substr($data,strpos($data,",")+1);

  file_put_contents($_POST['logoFilename'], base64_decode($uri));



data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs 9AAAACXBIWXMAAAsTAAALEwEAmpwYAAAAxklEQVQYlYWQMW7CUBBE33yITYUUmwbOkBtEcgUlTa7COXIVV5RUkXKC5AxU EdyZVD4kyKxkwIrr9vd0c7Oih aopinLNsF6Qkg2XW4XJ7LGFsAAcTV6lF5/jLdbALA9XDAXYfthFQVx OrmqKYK88/7rbbMFksALieTnzu9wDYTj6f70PKsp2kwAiSvjXNcvkWpAfNZkzWa/5a9yT7fdoX7rrB7hYh2fXo9HdjPYQZu3MIU8bYIlW20y0RUlXG2Kpv/vfwLxhTaSQwWqwhAAAAAElFTkSuQmCC

Below the code is the actual image as a Data-URI. 'logoImage' is the string above, and $uri is the string minus 'image/jpeg;base64,'.

解决方案

A quick look at the PHP manual yields the following:

If you want to save data that is derived from a Javascript canvas.toDataURL() function, you have to convert blanks into plusses. If you do not do that, the decoded data is corrupted:

<?php
  $encodedData = str_replace(' ','+',$encodedData);
  $decodedData = base64_decode($encodedData);
?>

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