2017-02-21 14:11
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在wordpress中创建rest api时无法修改头错误

I am trying to create a REST API which generate json data for wordpress posts. The code below is in functions.php file:

add_action('wp_enqueue_scripts', 'create_json_data', 0);
function create_json_data(){
    if (isset($_GET['getjson'])  && $_GET['getjson'] == true) {
        if (have_posts()) {
            $data = array();
            while (have_posts()) {
                $new_data = array(
                    "title" => get_the_title(), 
                    "content" => get_the_excerpt(), 
                    "image" => get_the_post_thumbnail_url(),
                    "hyperlink" => get_the_permalink()
                array_push($data, $new_data);
        header('Content-type: application/json');
        echo json_encode($data);

It runs very well in newly wordpress installation. But when I implement it in my online website it gives me error

Warning: Cannot modify header information - headers already sent by (output started at /home1/public_html/blogsite/wp-content/themes/webtheme/header.php:10) in /home1/public_html/website-theme/wp-content/themes/webtheme/functions.php on line 159

at line 10 in header.php is wp_head()

I don't know how to get ride of this error to generate json data only.

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1条回答 默认 最新

  • dongxin991209 2017-02-21 14:19

    You need to create custom AJAX action. You will find everything you need on the codex :

    Or you can use the Wordpress REST API plugin. It's allow you to create your own API endpoint.

    EDIT I give you a little example, with the jQuery ajax code to call it.

    add_action('wp_ajax_XXXXXX', 'ajax_XXXXXX');
    add_action('wp_ajax_nopriv_XXXXXX', 'ajax_XXXXXX');
    function ajax_XXXXXX() {
        header('Content-Type: application/json');
        echo json_encode(array(
            'text' => "Lorem ipsum dolor ...",
            'time' => time(),
            'user_id' => get_current_user_id()
        url : "/wp-admin/admin-ajax.php",
        method : "POST",
        data : {
            action : "XXXXXX"
        success : function(datas) {
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