PHP cURL调用WordPress REST API获取分类报rest_missing_callback_param错误

核心错误 #

你调用WordPress REST API获取分类时用了POST请求，但/wp/v2/categories接口的GET方法才是用来查询分类列表的，POST方法是创建新分类的接口，而创建分类必须传name参数，这就是你收到rest_missing_callback_param错误的直接原因。

修复步骤 #

1. 把请求方法改成GET #

修改curlExecute函数，将POST请求改为GET，同时把参数拼接到URL上，而不是放在POST请求体里：

function curlExecute($url, $headers, $data = null)
{
  $ch = curl_init();
  // 有参数的话拼接成URL查询字符串
  if ($data) {
    $url .= '?' . http_build_query($data);
  }
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_POST, false); // 改为GET请求
  curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  $response = curl_exec($ch);
  curl_close($ch);
  
  return $response;
}

2. 移除多余请求头 #

GET请求不需要发送JSON请求体，删掉Content-Type: application/json这个头：

$headers = array(
  'Authorization: Basic ' . base64_encode($username.":".$applicationPassword)
);

3. 调整per_page参数 #

WordPress REST API默认per_page最大值是100，设成9999会被自动截断成100。如果要获取所有分类，要么分页请求，要么通过WordPress过滤器rest_post_collection_params修改最大值。

修正后的完整代码 #

<?php

include 'db-connect.php';
$conn = OpenCon();
$conn->set_charset("utf8");

$siteId = $_REQUEST["site-id"];

$sqlWebsite = "SELECT setting_value FROM ai_settings WHERE id = ".$siteId;

$queryWebsite = mysqli_query($conn, $sqlWebsite);
$rowWebsite = mysqli_fetch_row($queryWebsite);

$websiteArray = json_decode($rowWebsite[0]);

$site_url = "https://" . $websiteArray->url;
$username = $websiteArray->user;
$applicationPassword = $websiteArray->pass;

$categoriesEndpont = $site_url . '/wp-json/wp/v2/categories';

$headers = array(
  'Authorization: Basic ' . base64_encode($username.":".$applicationPassword)
);

$data = array(
  'per_page' => 100 // 使用默认最大值，或按需调整
);

// 获取分类
$categoriesResponse = curlExecute($categoriesEndpont, $headers, $data);
print_r($categoriesResponse);

function curlExecute($url, $headers, $data = null)
{
  $ch = curl_init();
  if ($data) {
    $url .= '?' . http_build_query($data);
  }
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_POST, false);
  curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  $response = curl_exec($ch);
  curl_close($ch);
  
  return $response;
}

?>

内容的提问来源于stack exchange，提问作者VORiAND