默认情况下，Wordpress不允许上载SVG文件

Add svg file type in allowed file types list

function wp_mime_types($mimes)
{
    $mimes[\'svg\'] = \'image/svg+xml\';
    return $mimes;
}
add_filter(\'upload_mimes\', \'wp_mime_types\');

Fix for displaying svg files in media library

function wp_fix_svg() {
    echo \'<style type="text/css">
        .attachment-266x266, .thumbnail img {
         width: 100% !important;
         height: auto !important;
        }
        </style>\';
}
add_action( \'admin_head\', \'wp_fix_svg\' );

Attempt to determine the real file type of a file

function wp_check_filetype($data, $file, $filename, $mimes) 
{
    global $wp_version;
    if( $wp_version !== \'4.7.1\' ){
        return $data;
    }

    $filetype = wp_check_filetype( $filename, $mimes );

    return [
        \'ext\'             => $filetype[\'ext\'],
        \'type\'            => $filetype[\'type\'],
        \'proper_filename\' => $data[\'proper_filename\']
    ];
}
add_filter( \'wp_check_filetype_and_ext\', \'wp_check_filetype\', 10, 4 );