thinkphp's I() method is called on other php

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Release: 2023-03-24 15:10:01
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    /**
     * 获取输入参数 支持过滤和默认值
     * 使用方法:
     * <code>
     * I(&#39;id&#39;,0); 获取id参数 自动判断get或者post
     * I(&#39;post.name&#39;,&#39;&#39;,&#39;htmlspecialchars&#39;); 获取$_POST[&#39;name&#39;]
     * I(&#39;get.&#39;); 获取$_GET
     * </code>
     * @param string $name 变量的名称 支持指定类型
     * @param mixed $default 不存在的时候默认值
     * @param mixed $filter 参数过滤方法
     * @return mixed
     */
    function I($name,$default=&#39;&#39;,$filter=null) {
        if(strpos($name,&#39;.&#39;)) { // 指定参数来源
            //判断参数$name中是否包括.号
            list($method,$name) =   explode(&#39;.&#39;,$name,2);
            //如果包括.号将.号前后分隔,并且分别赋值给$method以及$name
        }else{ // 默认为自动判断
            //如果没有.号
            $method =   &#39;param&#39;;
        }
        switch(strtolower($method)) {//将$method转换为小写
            //如果$method为get,则$input为$_GET
            case &#39;get&#39;     :   $input =& $_GET;break;
            //如果$method为get,则$input为$_POST
            case &#39;post&#39;    :   $input =& $_POST;break;
            //如果为put,则将post的原始数据转参数给$input
            case &#39;put&#39;     :   parse_str(file_get_contents(&#39;php://input&#39;), $input);break;
            //如果是param
            case &#39;param&#39;   :
                //判断$_SERVER[&#39;REQUEST_METHOD&#39;]
                switch($_SERVER[&#39;REQUEST_METHOD&#39;]) {
                    //如果为post,则$input的内容为$_POST的内容
                    case &#39;POST&#39;:
                        $input  =  $_POST;
                        break;
                    //如果为PUT.则input的内容为PUT的内容
                    case &#39;PUT&#39;:
                        parse_str(file_get_contents(&#39;php://input&#39;), $input);
                        break;
                    //默认为$_GET的内容
                    default:
                        $input  =  $_GET;
                }
                break;
            //如果$method为request,则$input为$_REQUEST
            case &#39;request&#39; :   $input =& $_REQUEST;   break;
            //如果$method为session,则$input为$_SESSION
            case &#39;session&#39; :   $input =& $_SESSION;   break;
            //如果$method为cookie,则$input为$_COOKIE
            case &#39;cookie&#39;  :   $input =& $_COOKIE;    break;
            //如果$method为server,则$input为$_SERVER
            case &#39;server&#39;  :   $input =& $_SERVER;    break;
            //如果$method为globals,则$input为$GLOBALS
            case &#39;globals&#39; :   $input =& $GLOBALS;    break;
            //默认返回空
            default:
                return NULL;
        }
        /**
         * 到此为止,已经根据传入的参数的需要(第一个参数.号前面的),把所有的变量都取到了。下面就是返回变量的内容了。
        **/
        //如果$name为空,也就是I()第一个参数的.号后面为空的时候
        if(empty($name)) { // 获取全部变量
            //获取到的变量$input全部复制给$data
            $data       =   $input;
            //array_walk_recursive — 对数组中的每个成员递归地应用用户函数
            //将$data的键值作为filter_exp函数的第一个参数,键名作为第二个参数
            //如果$data的键值中含有or或者exp这两个字符,自动在后面加一个空格
            array_walk_recursive($data,&#39;filter_exp&#39;);
            //判断过滤参数是否有,如果有的话,就直接使用过滤方法,如果没有的话,就使用配置中的过滤方法
            $filters    =   isset($filter)?$filter:C(&#39;DEFAULT_FILTER&#39;);
            if($filters) {
                $filters    =   explode(&#39;,&#39;,$filters);
                //将过滤参数中的每个方法都应用到$data中
                foreach($filters as $filter){
                    //将$data的每个值使用$filters过滤
                    $data   =   array_map_recursive($filter,$data); // 参数过滤
                }
            }
        }elseif(isset($input[$name])) { // 取值操作
            $data       =   $input[$name];
            is_array($data) && array_walk_recursive($data,&#39;filter_exp&#39;);
            //$filters    =   isset($filter)?$filter:C(&#39;DEFAULT_FILTER&#39;);&#39;htmlspecialchars&#39;
            $filters    =   isset($filter)?$filter:&#39;htmlspecialchars&#39;;
            if($filters) {
                $filters    =   explode(&#39;,&#39;,$filters);
                foreach($filters as $filter){
                    if(function_exists($filter)) {
                        $data   =   is_array($data)?array_map_recursive($filter,$data):$filter($data); // 参数过滤
                    }else{
                        $data   =   filter_var($data,is_int($filter)?$filter:filter_id($filter));
                        if(false === $data) {
                            return   isset($default)?$default:NULL;
                        }
                    }
                }
            }
        }else{ // 变量默认值
            $data       =    isset($default)?$default:NULL;
        }
        return $data;
    }
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