audiotheme-encode-svg.php

<?php
/**
 * Return a base64 encoded SVG icon for use as a data URI.
 *
 * @param string $path Path to SVG icon.
 * @return string
 */
function audiotheme_encode_svg( $path ) {
	$path = path_is_absolute( $path ) ? $path : AUDIOTHEME_DIR . $path;

	if ( ! file_exists( $path ) || 'svg' != pathinfo( $path, PATHINFO_EXTENSION ) ) {
		return '';
	}

	return 'data:image/svg+xml;base64,' . base64_encode( file_get_contents( $path ) );
}