How to Fix Base64 to Image Conversion Errors Caused by Invalid Data?

Convert Base64 String to an Image File

When attempting to convert a Base64 string to an image file, errors can arise due to invalid image data. This error may occur when the Base64 string includes "data:image/png;base64," which can cause decoding issues.

To resolve this error, remove the "data:image/png;base64," portion before decoding the Base64 string. The following code snippet illustrates how to modify the decoding function:

function base64_to_jpeg($base64_string, $output_file) {
    // open the output file for writing
    $ifp = fopen( $output_file, 'wb' ); 

    // split the string on commas
    // $data[ 0 ] == "data:image/png;base64"
    // $data[ 1 ] == <actual base64 string>
    $data = explode( ',', $base64_string );

    // we could add validation here with ensuring count( $data ) > 1
    fwrite( $ifp, base64_decode( $data[ 1 ] ) );

    // clean up the file resource
    fclose( $ifp ); 

    return $output_file; 
}

By removing the unnecessary header, you ensure that the decoding process only operates on the actual base64-encoded image data. This corrected code will successfully convert the Base64 string to a valid image file.

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