下面的PHP代码允许用户在WordPress前端上传文件。我搜索了几个小时，但无法显示上传文件的URL。

我输入索引。php

    <?php
if ( isset( $_POST[\'upload_attachments\'] ) && $_SERVER[\'REQUEST_METHOD\'] === \'POST\' && wp_verify_nonce($_POST[\'secure_upload\'], \'upload_attachments_nonce\')) {

    //checking if upload is empty
    //checking if universal filesize is valid

    if ($_FILES) { //loop through multiple files.         
        $files = $_FILES[\'upload\'];
        foreach ($files[\'name\'] as $key => $value) {
            if ($files[\'name\'][$key]) {
                $file = array(
                    \'name\'     => $files[\'name\'][$key],
                    \'type\'     => $files[\'type\'][$key],
                    \'tmp_name\' => $files[\'tmp_name\'][$key],
                    \'error\'    => $files[\'error\'][$key],
                    \'size\'     => $files[\'size\'][$key]
                );

                $uploaded_file_type = $files[\'type\'][$key];
                $allowed_file_types = array(\'application/x-zip-compressed\', \'image/jpg\', \'image/jpeg\', \'image/png\', \'application/pdf\', \'application/zip\', \'video/mp4\');
                $uploaded_file_size = $files[\'size\'][$key];
                $size_in_kb = $uploaded_file_size / 1024;
                $file_size_limit = 10000; // Your Filesize in KB


                if(in_array($uploaded_file_type,  $allowed_file_types)) { 
                   if( $size_in_kb > $file_size_limit ) {
                   $upload_error .= \'Image files must be smaller than \'.$file_size_limit.\'KB\';
                   return;
                   } else {
                   $_FILES = array("upload" => $file);
                   foreach ($_FILES as $file => $array) {
                   $newupload = insert_attachment($file,$post_id);
                   //return; this loop neds to run multiple times so no return here
                 }      
                 }
                 } else { $upload_error .= \'Invalid File type\';
                         return;
                        }                                                              

                }
            }
        }                  

    header (\'Location: \' . $_SERVER[\'REQUEST_URI\']);//Post, redirect and get
    exit();
    }//end of nonce check ?>

这就是函数。php

    function insert_attachment($file_handler,$post_id,$setthumb=\'false\') {

    // check to make sure its a successful upload
    if ($_FILES[$file_handler][\'error\'] !== UPLOAD_ERR_OK) __return_false();

    require_once(ABSPATH . "wp-admin" . \'/includes/image.php\');
    require_once(ABSPATH . "wp-admin" . \'/includes/file.php\');
    require_once(ABSPATH . "wp-admin" . \'/includes/media.php\');

    $attach_id = media_handle_upload( $file_handler, $post_id );

    //if ($setthumb) update_post_meta($post_id,\'_thumbnail_id\',$attach_id);
    return $attach_id;
}

附加问题此代码不允许上载rar文件它只上载zip文件，是否也可以上载rar文件？

提前感谢

/**
 * Source: @link https://developer.wordpress.org/reference/hooks/upload_mimes/
 *
 */
add_filter( \'upload_mimes\', \'add_custom_upload_mimes\' );
function add_custom_upload_mimes( $existing_mimes )
{
   return array_merge( $existing_mimes, array(
      \'rar\' => \'application/rar\'
    ));

  return $existing_mimes;
}