爲什麼我將「\ r \ n \ r \ n0」傳遞到我的成功函數中？

Question

我不知道爲什麼每當我進行AJAX調用時，爲什麼retInfo就是"\r\n\r\n0"。

function getEightMore () 
{ 
    // show loading icon 
    $('#load-more-row img').css('visibility', 'visible'); 

    // get the next 8 or fewer projects 
    formdata = new FormData(); 
    formdata.append('numItemsLoaded', numItemsLoaded) 
    formdata.append('workType', workType) 
    formdata.append('action', 'get_eight_more'); 
    $.ajax({ 
     url: ajaxurl, 
     type: 'POST', 
     async: false, 
     data: formdata, 
     success: function (retInfo) { 
      console.log(JSON.stringify(retInfo)); // test     
     }, 
     cache: false, 
     contentType: false, 
     processData: false 
    });  

    //$('#load-more-row img').css('visibility', 'hidden'); 
} 

服務器端代碼：

// make AJAX handler for getting more projects or case studies 
add_action('wp_ajax_get_eight_more', 'get_eight_more'); 

function get_eight_more () 
{ 
    $workType = $_POST['workType']; 
    $numItemsLoaded = $_POST['numItemsLoaded']; 
    global $wpdb; 
    $nstr = strval(intval($numItemsLoaded) + 1); 
    $nextEightRows = $wpdb->query('SELECT id,name,sumsmall FROM ' . $_POST['workType'] . 'ORDER BY postdate LIMIT 8, ' . $nstr); 
    echo(json_encode($nextEightRows)); 

} 

我什至不知道它有什麼與我的PHP函數get_eight_more ()的身體，因爲我試圖改變它的東西一樣die(json_encode("This is a test"));，我仍然收到"\r\n\r\n0"。那個神祕的字符串從哪裏來？這是什麼意思？

Answer 1

你必須使用die();後回顯你的迴應（這是0是從）。

echo json_encode($nextEightRows); 
die(); // or wp_die();