Allow SVG Files Upload

Add support for SVG files to be uploaded in WordPress media.

<?php
/**
 * Allow SVG uploads for administrator users.
 *
 * @param array $upload_mimes Allowed mime types.
 *
 * @return mixed
 */
add_filter(
 'upload_mimes',
 function ( $upload_mimes ) {
  // By default, only administrator users are allowed to add SVGs.
  // To enable more user types edit or comment the lines below but beware of
  // the security risks if you allow any user to upload SVG files.
  if ( ! current_user_can( 'administrator' ) ) {
   return $upload_mimes;
  }
  $upload_mimes['svg']  = 'image/svg+xml';
  $upload_mimes['svgz'] = 'image/svg+xml';
  return $upload_mimes;
 }
);
/**
 * Add SVG files mime check.
 *
 * @param array        $wp_check_filetype_and_ext Values for the extension, mime type, and corrected filename.
 * @param string       $file Full path to the file.
 * @param string       $filename The name of the file (may differ from $file due to $file being in a tmp directory).
 * @param string[]     $mimes Array of mime types keyed by their file extension regex.
 * @param string|false $real_mime The actual mime type or false if the type cannot be determined.
 */
add_filter(
 'wp_check_filetype_and_ext',
 function ( $wp_check_filetype_and_ext, $file, $filename, $mimes, $real_mime ) {
  if ( ! $wp_check_filetype_and_ext['type'] ) {
   $check_filetype  = wp_check_filetype( $filename, $mimes );
   $ext             = $check_filetype['ext'];
   $type            = $check_filetype['type'];
   $proper_filename = $filename;
   if ( $type && 0 === strpos( $type, 'image/' ) && 'svg' !== $ext ) {
    $ext  = false;
    $type = false;
   }
   $wp_check_filetype_and_ext = compact( 'ext', 'type', 'proper_filename' );
  }
  return $wp_check_filetype_and_ext;
 },
 10,
 5
);