How to Convert Data-URIs from JavaScript into Files in PHP?

Saving Data-URIs as Files in PHP

This article addresses the challenge of converting data-URIs retrieved from JavaScript into file formats using PHP.

Overview of the Issue

Developers face a common problem when attempting to save data-URIs as image files in PHP. The resulting images typically appear corrupted due to a mismatch in encoding. Specifically, when a data-URI is extracted from a JavaScript canvas element using the toDataURL() method, spaces within the URI get converted to pound signs (#), while PHP expects plus signs ( ) in their place.

Solution

To resolve this issue, developers need to replace these pound signs with plus signs before decoding the data-URI using the base64_decode() function. The PHP manual provides an example:

<code class="php">$encodedData = str_replace(' ','+',$encodedData);
$decodedData = base64_decode($encodedData);</code>

By properly encoding the data-URI before decoding, developers can ensure that the resulting image files are properly represented and free of corruption.

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