How to Determine Image Type from Encoded Base64 String in PHP?

Determining Image Type from Encoded Base64 String in PHP

Differentiating the type of an image from its base64 representation poses a challenge in PHP, given that traditional methods like imagecreatefromstring() lack the ability to reliably determine the original image type.

Solution Using FileInfo

In such scenarios, leveraging the FileInfo extension proves invaluable. This extension enables the precise detection of MIME types, including those of images. The following code demonstrates its usage:

<code class="php">$encoded_string = "....";
$imgdata = base64_decode($encoded_string);

$f = finfo_open();

$mime_type = finfo_buffer($f, $imgdata, FILEINFO_MIME_TYPE);</code>

By utilizing finfo_buffer, you can obtain the MIME type of the decoded image data, which accurately reflects the original image format. This MIME type can subsequently be employed to determine the image type (e.g., PNG, JPEG, GIF) and save the image with the appropriate extension.

Now, armed with this knowledge, you can confidently save your image while preserving its original type, ensuring that the saved file remains faithful to the source material.

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