将'php：// input'数据合并到$ _REQUEST

<?php

/**
 * 使用fetch异步请求数据，数据需要使用php://input来获取
 * 此方法将php://input数据并入$_REQUEST
 *
 * @author Jason
 * @DateTime 2017-12-04 13:51
 * @access public
 * @return array
 */
function merge_php_input() {
    // 请求方法
    $method = PHP_SAPI == 'cli' ? 'GET' : $_SERVER['REQUEST_METHOD'];
    // php input流数据
    $content = file_get_contents('php://input');

    // 获取请求的content type
    $contentType = $_SERVER['CONTENT_TYPE'];
    if ($contentType) {
        if (strpos($contentType, ';')) {
            list($type) = explode(';', $contentType);
        } else {
            $type = $contentType;
        }
        $contentType = trim($type);
    }

    // 自动获取请求变量
    switch ($method) {
        case 'POST': {
            if (empty($_POST) && false !== strpos($contentType, 'application/json')) {
                $vars = (array) json_decode($content, true);
                $_POST = $vars;
            } else {
                $vars = $_POST;
            }
        } break;
        case 'PUT':
        case 'DELETE':
        case 'PATCH':{
            if (false !== strpos($contentType, 'application/json')) {
                $vars = (array) json_decode($content, true);
            } else {
                parse_str($content, $vars);
            }
        } break;
        default:
            $vars = [];
    }

    // 当前请求参数和URL地址中的参数合并
    $_REQUEST = array_merge($_REQUEST, $_GET, $vars);

    return $_REQUEST;
}