PHP POST请求中含重复键的screening_questions数组重组问询

我用PHP向API提交表单数据，该API要求screening_questions字段使用重复键。目前大部分字段已正确放入请求数组，但screening_questions是嵌套数组形式，合并展开时因为键名重复，只会保留最后一组数据。我需要把嵌套的screening_questions数组展开成包含重复键的结构：

原数组 #

Array
(
    [candidate[resume]] => CURLFile Object
        (
            [name] => /nas/content/live/powerhrg2/wp-content/uploads/gravity_forms/5-51403278f6166fe42c507d417f729fc5/2023/02/Power-HRG-Tech-Spec256.pdf
            [mime] => application/pdf
            [postname] => Power-HRG-Tech-Spec256.pdf
        )
    [candidate[first_name]] => John
    [candidate[last_name]] => Johnson
    [candidate[email]] => john.johnson@email.net
    [candidate[phone]] => 555-555-5555
    [job_posting_public_id] => 28038a67e70c7e235fa725bbf8b6e167d9e3efee1e43a304d73be8408c6f24a2
    [candidate[source_id]] => 7795
    [0] => Array
        (
            [screening_questions[][id]] => 1
            [screening_questions[][answer]] => false
        )
    [1] => Array
        (
            [screening_questions[][id]] => 6
            [screening_questions[][answer]] => true
        )
    [2] => Array
        (
            [screening_questions[][id]] => 11
            [screening_questions[][answer]] => true
        )
    [3] => Array
        (
            [screening_questions[][id]] => 16
            [screening_questions[][answer]] => true
        )
)

目标数组 #

Array
(
    [candidate[resume]] => CURLFile Object
        (
            [name] => /nas/content/live/powerhrg2/wp-content/uploads/gravity_forms/5-51403278f6166fe42c507d417f729fc5/2023/02/Power-HRG-Tech-Spec256.pdf
            [mime] => application/pdf
            [postname] => Power-HRG-Tech-Spec256.pdf
        )
    [candidate[first_name]] => John
    [candidate[last_name]] => Johnson
    [candidate[email]] => john.johnson@email.net
    [candidate[phone]] => 555-555-5555
    [job_posting_public_id] => 28038a67e70c7e235fa725bbf8b6e167d9e3efee1e43a304d73be8408c6f24a2
    [candidate[source_id]] => 7795
    [screening_questions[][id]] => 1
    [screening_questions[][answer]] => false
    [screening_questions[][id]] => 6
    [screening_questions[][answer]] => true
    [screening_questions[][id]] => 11
    [screening_questions[][answer]] => true
    [screening_questions[][id]] => 16
    [screening_questions[][answer]] => true
)

我暂时想不到合并或扁平化这些数组的方法，也想了解是否有其他格式可实现带唯一值的重复screening_questions键提交。以下是我的完整代码：

add_action( 'gform_after_submission_5', 'post_to_third_party', 10, 2 );
function post_to_third_party( $entry, $form ) {
    // get regular form field data
    $first_name = rgar( $entry, '1' );
    $last_name = rgar( $entry, '3' );
    $phone = rgar( $entry, '11' );
    $phone = preg_replace("/[^0-9]/", "", $phone);
    $phone = preg_replace('/^1?(\d{3})(\d{3})(\d{4})$/', '$1-$2-$3', $phone);
    $email = rgar( $entry, '6' );
    $resume = GFFormsModel::get_physical_file_path( rgar( $entry, '7' ) );
    $resume = new CURLFile($resume, mime_content_type($resume), basename($resume));
    $job = get_job(); // get current job ID & source ID
    $job_id = $job['id'];
    $source_id = $job['source_id'];
    // get screening questions id & answer data
    foreach ( $form['fields'] as $field ) {
        if ($field['type'] === 'radio') {
            $field_values[] = preg_replace('/[^0-9.]/', '', $field->get_value_export( $entry, $field->id )); // i.e. converts 'yes-1' to '1' 
            $field_names[]  = $field->get_value_export( $entry, $field->id, true ); // yes
        }
    }
    // remove empty data
    $field_values = array_slice(array_filter($field_values),0);
    $field_names = array_slice(array_filter($field_names),0);
    
    // combine screening id & answer
    $screening_questions = array_combine($field_values, $field_names);
    foreach ($screening_questions as $screening_question=>$sq) {
        // value must be true/false, not yes/no
        if ($sq == 'yes') {
            $sq = 'true';
        } else {
            $sq = 'false';
        }
        $question[] = array('screening_questions[][id]' => $screening_question, 'screening_questions[][answer]' => $sq);
    }
    // create an array of form data to send via the API
    $body = array(
        'candidate[resume]' => $resume,
        'candidate[first_name]' => $first_name,
        'candidate[last_name]' => $last_name,
        'candidate[email]' => $email,
        'candidate[phone]' => $phone,
        'job_posting_public_id' => $job_id,
        'candidate[source_id]' => $source_id,
    );
    foreach ($question as $q) {
        array_push($body,$q);
    }
    $post_url = 'https://pr29718.nitro-web.beta.hq.powerapp.cloud/recruiting/api/v2/candidates'; // TEST URL
    $pass = 'AMC0HNUK30RTFATWWKBJTW'; // TEST TOKEN
    $headers = array(
        'Host: pr29718.nitro-web.beta.hq.powerapp.cloud',
        'Authorization: '.$pass,
    );
    // Uncomment the below line to debug, if necessary
    GFCommon::log_debug( 'gform_after_submission: body => ' . print_r( $body, true ) );
    // Uncomment the below line to debug, if necessary
    GFCommon::log_debug( 'gform_after_submission: headers => ' . print_r( $headers, true ) );
    // Nitro API request via cURL
    $curl = curl_init();
    curl_setopt_array($curl, array(
        CURLOPT_URL => 'https://pr29718.nitro-web.beta.hq.powerapp.cloud/recruiting/api/v2/candidates',
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_ENCODING => '',
        CURLOPT_MAXREDIRS => 10,
        CURLOPT_TIMEOUT => 0,
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
        CURLOPT_CUSTOMREQUEST => 'POST',
        CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => $body,
        CURLOPT_HEADER => true,
        CURLOPT_HTTPHEADER => $headers,
    ));
    $response = curl_exec($curl);
    curl_close($curl);
    // Uncomment below line to debug, if necessary
    GFCommon::log_debug( 'gform_after_submission: response => ' . print_r( $response, true ) );
}

解决方案 #

方法1：直接构建适配cURL的重复键请求体 #

PHP关联数组不允许重复键，但cURL处理CURLOPT_POSTFIELDS时，若传入索引数组（每个元素是单个键值对的关联数组），会自动生成带重复键的表单数据。修改构建请求体的逻辑：

// 省略前面获取字段的代码...

// 初始化body为索引数组，逐个添加字段
$body = [];

// 添加固定字段
$body[] = ['candidate[resume]' => $resume];
$body[] = ['candidate[first_name]' => $first_name];
$body[] = ['candidate[last_name]' => $last_name];
$body[] = ['candidate[email]' => $email];
$body[] = ['candidate[phone]' => $phone];
$body[] = ['job_posting_public_id' => $job_id];
$body[] = ['candidate[source_id]' => $source_id];

// 处理筛选问题，将每个id和answer拆分为独立元素
foreach ($screening_questions as $screening_question=>$sq) {
    $sq = $sq == 'yes' ? 'true' : 'false';
    $body[] = ['screening_questions[][id]' => $screening_question];
    $body[] = ['screening_questions[][answer]' => $sq];
}

// 后续cURL代码保持不变

方法2：API支持的话用JSON格式提交（更规范） #

如果API接受application/json请求体，可以用嵌套数组替代重复键，结构更清晰：

// 省略前面获取字段的代码...

// 构建JSON结构的请求体
$jsonBody = [
    'candidate' => [
        'first_name' => $first_name,
        'last_name' => $last_name,
        'email' => $email,
        'phone' => $phone,
        'source_id' => $source_id
        // 注意：文件上传通常不支持JSON格式，若需传简历仍用表单提交
    ],
    'job_posting_public_id' => $job_id,
    'screening_questions' => []
];

// 添加筛选问题
foreach ($screening_questions as $id => $answer) {
    $jsonBody['screening_questions'][] = [
        'id' => $id,
        'answer' => $answer === 'yes' ? true : false
    ];
}

// 修改cURL配置发送JSON
$headers[] = 'Content-Type: application/json';
curl_setopt_array($curl, [
    CURLOPT_URL => 'https://pr29718.nitro-web.beta.hq.powerapp.cloud/recruiting/api/v2/candidates',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => '',
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 0,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => 'POST',
    CURLOPT_POSTFIELDS => json_encode($jsonBody),
    CURLOPT_HEADER => true,
    CURLOPT_HTTPHEADER => $headers,
]);

内容的提问来源于stack exchange，提问作者Trisha