How to Handle Spaces in Data URIs During File Conversion in PHP?

How to Convert Data-URI to a File in PHP

When attempting to save a data URI received from JavaScript using PHP, using the following code might result in a corrupted image file:

<code class="php">$data = $_POST['logoImage'];
$uri = substr($data, strpos($data, ",") + 1);
file_put_contents($_POST['logoFilename'], base64_decode($uri));</code>

The underlying reason is the presence of spaces in the data URI that need to be converted to plus signs.

Solution:

The PHP documentation suggests that for data derived from a Javascript canvas.toDataURL() function, spaces should be replaced with plus signs before decoding.

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

Incorporating this modification into the original code should successfully save the image file:

<code class="php">$data = $_POST['logoImage'];
$uri = substr($data, strpos($data, ",") + 1);
$encodedData = str_replace(' ', '+', $uri);
$decodedData = base64_decode($encodedData);
file_put_contents($_POST['logoFilename'], $decodedData);</code>

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