Allow SVG Upload in WordPress Media Uploader

allow_svg.php

<?php
//Allow SVG upload
add_filter( 'upload_mimes', 'inn_mime_types' );
function inn_mime_types( $mimes ) {
	$mimes['svg']  = 'image/svg+xml';
	$mimes['svgz'] = 'image/svg+xml';

	return $mimes;
}

//display SVG Images in wp media uploader proberly
add_filter( 'wp_prepare_attachment_for_js', 'inn_svgs_response_for_svg', 10, 3 );
function inn_svgs_response_for_svg( $response, $attachment, $meta ) {
	if ( $response['mime'] == 'image/svg+xml' && empty( $response['sizes'] ) ) {
		$svg_path = get_attached_file( $attachment->ID );
		if ( ! file_exists( $svg_path ) ) {
			// If SVG is external, use the URL instead of the path
			$svg_path = $response['url'];
		}
		$dimensions = inn_svgs_get_dimensions( $svg_path );
		$response['sizes'] = array(
			'full' => array(
				'url'         => $response['url'],
				'width'       => $dimensions->width,
				'height'      => $dimensions->height,
				'orientation' => $dimensions->width > $dimensions->height ? 'landscape' : 'portrait'
			)
		);
	}

	return $response;
}

function inn_svgs_get_dimensions( $svg ) {
	$svg = simplexml_load_file( $svg );
	if ( $svg === false ) {
		$width  = '0';
		$height = '0';
	} else {
		$attributes = $svg->attributes();
		$width      = (string) $attributes->width;
		$height     = (string) $attributes->height;
	}
	return (object) array( 'width' => $width, 'height' => $height );
}