PHP: Get data URI string from an image file.

get_data_uri.php

<?php

/**
 * Get data URI string from an image file.
 *
 * @param  string $path_to_file
 * @return string
 */
function get_data_uri( string $path_to_file ) : string
{

	$contents = file_get_contents( $path_to_file );
	$base64 = base64_encode( $contents );
	$imagetype = exif_imagetype( $file );
	$mime = image_type_to_mime_type( $imagetype );
  
	return "data:$mime;base64,$base64";
}