php 新手遇到的点点滴滴集合 一只整理中

1、接收表单POST过来的数据时报Undefined>如下：$name=$_POST['username'];

用以上代码总是提示

Notice: Undefined>（本人亲自测试过）：

     1）在变量前面加上一个@，如$name = @$_POST['username'];

2）修改php.ini中的error配置下错误显示方式：

error_reporting=E_ALL & ~E_NOTICE;

修改后重启下apache服务器，方可生效

2、数据库表出入操作：datetime类型也是字符串

$datetime = date ( 'Y-m-d H:i:s', time () );
$sql = "insert into message (user,title,content,lastdate) " . "values ( '$user' , '$title' , '$content' , '$datetime' );";

3、return和echo的区别

echo 是指将内容输出到浏览器

return通常用于函数或方法中，返回执行结果

4、数组和对象的区别

Object( [id] => 1 [access_token] => XZXYb [refresh_token] => BGWSL[expires_in] => 2014-01-03 11:19:59 [scope] =>https )

Array( [id] => 1 [access_token] => XZXYb [refresh_token] => BGWSL[expires_in] => 2014-01-03 11:19:59 [scope] =>https )

访问方式：对象XX->id，数组XX.id

5、php发送请求的三种方式

class Request{

    public static function post($url, $post_data = '', $timeout = 5){//curl

        $ch = curl_init();

        curl_setopt ($ch, CURLOPT_URL, $url);

        curl_setopt ($ch, CURLOPT_POST, 1);

        if($post_data != ''){

            curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);

        }

        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);

        curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);

        curl_setopt($ch, CURLOPT_HEADER, false);

        $file_contents = curl_exec($ch);

        curl_close($ch);

        return $file_contents;

    }

    public static function post2($url, $data){//file_get_content

       

        $postdata = http_build_query(

            $data

        );

       

        $opts = array('http' =>

                      array(

                          'method'  => 'POST',

                          'header'  => 'Content-type: application/x-www-form-urlencoded',

                          'content' => $postdata

                      )

        );

       

        $context = stream_context_create($opts);

        $result = file_get_contents($url, false, $context);

        return $result;

    }

    public static function post3($host,$path,$query,$others=''){//fsocket

        $post="POST $path HTTP/1.1\r\nHost: $host\r\n";

        $post.="Content-type: application/x-www-form-";

        $post.="urlencoded\r\n${others}";

        $post.="User-Agent: Mozilla 4.0\r\nContent-length: ";

        $post.=strlen($query)."\r\nConnection: close\r\n\r\n$query";

        $h=fsockopen($host,80);

        fwrite($h,$post);

        for($a=0,$r='';!$a;){

                $b=fread($h,8192);

                $r.=$b;

                $a=(($b=='')?1:0);

            }

        fclose($h);

        return $r;

    }
}