WordPress增加文件上传类型

WordPress默认不允许上传.xml文件,否则会报”抱歉，由于安全原因，这个文件类型不受支持。”这个错误.

具体解决办法如下:
WordPress版本:WordPress 4.9.6

1.在WordPress中的wp-include/functions.php找到wp_get_mime_types函数,函数如下:

function wp_get_mime_types() {
/**
* Filters the list of mime types and file extensions.
*
* This filter should be used to add, not remove, mime types. To remove
* mime types, use the {@see 'upload_mimes'} filter.
*
* @since 3.5.0
*
* @param array $wp_get_mime_types Mime types keyed by the file extension regex
* corresponding to those types.
*/
return apply_filters( 'mime_types', array(
// Image formats.
'jpg|jpeg|jpe' => 'image/jpeg',
'gif' => 'image/gif',
'png' => 'image/png',
'bmp' => 'image/bmp',
'tiff|tif' => 'image/tiff',
'ico' => 'image/x-icon',
// Video formats.
'asf|asx' => 'video/x-ms-asf',
'wmv' => 'video/x-ms-wmv',
'wmx' => 'video/x-ms-wmx',
'wm' => 'video/x-ms-wm',
'avi' => 'video/avi',
'divx' => 'video/divx',
'flv' => 'video/x-flv',
'mov|qt' => 'video/quicktime',
'mpeg|mpg|mpe' => 'video/mpeg',
'mp4|m4v' => 'video/mp4',
'ogv' => 'video/ogg',
'webm' => 'video/webm',
'mkv' => 'video/x-matroska',
'3gp|3gpp' => 'video/3gpp', // Can also be audio
'3g2|3gp2' => 'video/3gpp2', // Can also be audio
// Text formats.
'txt|asc|c|cc|h|srt' => 'text/plain',
'csv' => 'text/csv',
'tsv' => 'text/tab-separated-values',
'ics' => 'text/calendar',
'rtx' => 'text/richtext',
'css' => 'text/css',
'htm|html' => 'text/html',
'vtt' => 'text/vtt',
'dfxp' => 'application/ttaf+xml',
// Audio formats.
'mp3|m4a|m4b' => 'audio/mpeg',
'aac' => 'audio/aac',
'ra|ram' => 'audio/x-realaudio',
'wav' => 'audio/wav',
'ogg|oga' => 'audio/ogg',
'flac' => 'audio/flac',
'mid|midi' => 'audio/midi',
'wma' => 'audio/x-ms-wma',
'wax' => 'audio/x-ms-wax',
'mka' => 'audio/x-matroska',
// Misc application formats.
'rtf' => 'application/rtf',
'js' => 'application/javascript',
'pdf' => 'application/pdf',
'swf' => 'application/x-shockwave-flash',
'class' => 'application/java',
'tar' => 'application/x-tar',
'zip' => 'application/zip',
'gz|gzip' => 'application/x-gzip',
'rar' => 'application/rar',
'7z' => 'application/x-7z-compressed',
'exe' => 'application/x-msdownload',
'psd' => 'application/octet-stream',
'xcf' => 'application/octet-stream',
// MS Office formats.
'doc' => 'application/msword',
'pot|pps|ppt' => 'application/vnd.ms-powerpoint',
'wri' => 'application/vnd.ms-write',
'xla|xls|xlt|xlw' => 'application/vnd.ms-excel',
'mdb' => 'application/vnd.ms-access',
'mpp' => 'application/vnd.ms-project',
'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
'docm' => 'application/vnd.ms-word.document.macroEnabled.12',
'dotx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
'dotm' => 'application/vnd.ms-word.template.macroEnabled.12',
'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
'xlsm' => 'application/vnd.ms-excel.sheet.macroEnabled.12',
'xlsb' => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12',
'xltx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
'xltm' => 'application/vnd.ms-excel.template.macroEnabled.12',
'xlam' => 'application/vnd.ms-excel.addin.macroEnabled.12',
'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
'pptm' => 'application/vnd.ms-powerpoint.presentation.macroEnabled.12',
'ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
'ppsm' => 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12',
'potx' => 'application/vnd.openxmlformats-officedocument.presentationml.template',
'potm' => 'application/vnd.ms-powerpoint.template.macroEnabled.12',
'ppam' => 'application/vnd.ms-powerpoint.addin.macroEnabled.12',
'sldx' => 'application/vnd.openxmlformats-officedocument.presentationml.slide',
'sldm' => 'application/vnd.ms-powerpoint.slide.macroEnabled.12',
'onetoc|onetoc2|onetmp|onepkg' => 'application/onenote',
'oxps' => 'application/oxps',
'xps' => 'application/vnd.ms-xpsdocument',
// OpenOffice formats.
'odt' => 'application/vnd.oasis.opendocument.text',
'odp' => 'application/vnd.oasis.opendocument.presentation',
'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
'odg' => 'application/vnd.oasis.opendocument.graphics',
'odc' => 'application/vnd.oasis.opendocument.chart',
'odb' => 'application/vnd.oasis.opendocument.database',
'odf' => 'application/vnd.oasis.opendocument.formula',
// WordPerfect formats.
'wp|wpd' => 'application/wordperfect',
// iWork formats.
'key' => 'application/vnd.apple.keynote',
'numbers' => 'application/vnd.apple.numbers',
'pages' => 'application/vnd.apple.pages',
) );
}