您可以尝试使用wp cron函数，大约每10分钟编写一次feed导入程序，直到队列中什么都没有。

示例代码：

<?php
register_activation_hook( __FILE__, \'wp1903_schedule_cron\' );

function wp1903_schedule_cron() {
    $counter = 0;
    $feeds = array(
        \'http://example.com/feed1\',
        \'http://example.com/feed2\',
        \'http://example.com/feed3\',
        \'http://example.com/feed4\'
    );

    foreach ($feeds as $feed) {
        $counter++;
        // schedule every 10 mins
        $time = time() + (600 * $counter);
        wp_schedule_single_event( $time, \'wp1903_process_feed\', $feed );
    }
}

add_action(\'wp1903_process_feed\', \'wp1903_import_feed\');

function wp1903_import_feed($feed_url = \'\') {
    // do the import
}

您已尝试通过以下方式延长脚本的最大执行时间set_time_limit()? 这不会导致服务器崩溃（因为它也有内存限制）：

set_time_limit( 0 ); // No time limit is imposed

如果feed的XML中有太多行，您可以做什么？您还可以创建自己的导入脚本，并通过逐个处理小部分来处理它。

$xml_handler = new ProductsParser();
$xml_parser  = xml_parser_create();

$source = \'--URL--\';

xml_set_object( $xml_parser, $xml_handler );
xml_parser_set_option( $xml_parser, XML_OPTION_CASE_FOLDING, false );
xml_set_element_handler( $xml_parser, \'startElement\', \'endElement\' );
xml_set_character_data_handler( $xml_parser, \'cdata\' );

$fp = fopen ( $source, \'r\' );
while ( $chunk = fread( $fp, 4096 ) ) {
  xml_parse( $xml_parser, $chunk, feof( $fp ) );
  flush();
}

fclose( $fp );

class ProductsParser {
  public $product; # Holds the record values
  public $elem_key; # Holds the current element key while reading
  public $record; # Holds the record tag

  function __construct( $args ) {
    $this->product  = false;
    $this->elem_key = false;
    $this->record   = \'--RECORD-NAME--\';
  }

  function startElement( $parser, $tag, $attributes ) {
    if ( $this->record == $tag && ! is_array( $this->product ) ) {
      $this->product = array();
    } elseif( is_array( $this->product ) ) {
      $this->elem_key = $tag;
    }
  }

  function endElement( $parser, $tag ) {
    if ( $this->record == $tag && is_array( $this->product ) ) {
      // Process the product row

      $this->product = false;
    } elseif ( is_array( $this->product ) && $this->elem_key != false ) {
      $this->elem_key = false;
    }
  }

  function cdata( $parser, $cdata ) {
    if ( is_array( $this->product ) && $this->elem_key != false ) {
      $this->product[$this->elem_key] = $cdata;
    }
  }
}

当涉及到高执行时间脚本时，我通常使用ajax尽可能简单地将其拆分，因此下面是一个概念类，可以让您开始创建管理页面和ajaxed导入循环：

<?php
class Ajax_Import{

    public function __construct(){
        if(is_admin()){
            add_action(\'admin_menu\', array($this, \'add_plugin_page\'));
        }
        add_action(\'wp_ajax_do_feed_import\',array($this,\'do_import\'));
    }

    public function add_plugin_page(){
        // This page will be under "Settings"
        add_options_page(\'ajaxed Import\', \'ajaxed Import\', \'manage_options\', \'test-setting-admin\', array($this, \'create_admin_page\'));
    }

    public function create_admin_page(){
        wp_enqueue_script( \'jquery\');
        ?>
        <div class="wrap">
            <?php screen_icon(); ?>
            <h2><?php _e(\'AJAXed Import\'); ?></h2>          
            <table class="form-table">
                <tbody>
                    <th scope="row">
                        <label for="my-text-field"><?php _e(\'Feeds To Import\'); ?></label>
                    </th>
                    <td>
                        <textarea id="feeds"></textarea>
                        <br>
                        <span class="description"><?php _e(\'Enter Each feed in a new line.\'); ?></span>
                    </td>
                </tbody>
            </table>
            <p class="submit"><input type="submit" id="do_import" value="Save Changes" class="button-primary" name="Submit"></p>
            <div id="import_status" style="display:none"></div>
        </div>
        <?php
        $this->import_loop_js();
    }

    public function do_import(){
        //do your import here ex:
        $rss = fetch_feed(esc_url( $_POST[\'feed_url\']));
        if (!is_wp_error( $rss ) ) {
            $count = $rss->get_item_quantity(); 
            //do actuall import loop or whatever
            echo json_encode(array(\'message\' => \'<div id="message" class="success"><p>imported \' . $count . \' items from \'.esc_url( $_POST[\'feed_url\']).\'</p></div>\'));
        }else{
            echo json_encode(array(\'errors\' => \'<div id="message" class="error"><p>\' . $rss->get_error_message() . \'</p></div>\'));
        }
        die();
    }

    public function import_loop_js(){
        ?>
        <script type="text/javascript">
        jQuery(document).ready(function($){
            var ajax_import = (function(){
                var instantiated;
                var feeds;
                function init (){
                    return {
                        start_import: function(){

                            instantiated.feeds = $("#feeds").val().split(\'\\n\');
                            instantiated.update_status(\'\', true);
                            instantiated.next_feed();
                        },
                        make_ajax_call:function(feed){
                            data = {
                                action: "do_feed_import",
                                feed_url: feed
                            };
                            $.post( 
                                ajaxurl,
                                data, 
                                function(res){
                                    if (res.error){//add error message
                                        instantiated.update_status(res.error);
                                    }else{//add success message
                                        instantiated.update_status(res.message);
                                    }
                                    //call next feed
                                    instantiated.next_feed();
                                }, 
                                \'json\'
                            );
                        },
                        next_feed:function(){
                            if (instantiated.feeds.length > 0) {//if we have feeds in the list starts ajax calls
                                instantiated.make_ajax_call(instantiated.feeds.shift());
                            } else{
                                instantiated.update_status("all Done!!!");
                                $("#do_import").removeAttr("disabled");
                            }
                        },
                        update_status:function(m,clear){
                            clear = clear || false;
                            if (clear)
                                $("#import_status").html(\'\').show();
                            else
                                $("#import_status").append(m);
                        }
                    }
                }

                return {
                    getInstance :function(){
                        if (!instantiated){
                            instantiated = init();
                        }
                        return instantiated; 
                    }
                }
            })();
            $("#do_import").on(\'click\',function(){
                $(this).attr(\'disabled\',\'disabled\');
                ajax_import.getInstance().start_import();
            });
        });
        </script>
        <?php

    }
}

$Ajax_Import = new Ajax_Import();