www.ndjsxh.com/upload.php

<?php
$filename = $_FILES["file"]["name"];
$temp = explode(".", $filename);
$csign = $_GET['sign'];
$time = $_GET['t'];
$sign = md5( $filename."_lvjunxi_".$time );
$extension = end($temp);     // 获取文件后缀名
$data = array('code'=>201, 'filename'=>$filename);
if( $sign != $csign ){
    $data["msg"] = "error sign";
    echo json_encode( $data );
    return;
}
if ( $_FILES["file"]["size"] < 409600 && $extension == "pdf"){
    if ($_FILES["file"]["error"] > 0){
        $data["msg"] = "error file";
        echo json_encode( $data );
    }else{ 
        try{
            $res=move_uploaded_file($_FILES["file"]["tmp_name"], "pdf/".$filename );
            $data["code"] = "200";
            echo json_encode( $data );
        } catch (Exception $e) {
            echo $e->getMessage();
        }
    }
}else{
    $data["msg"] = "error size";
    echo json_encode( $data );
}
?>