PHP file upload and basic use of uploadifive

<form action="upload_file.php" method="post" enctype="multipart/form-data">

    <label for="file">文件名:</label>

    <input type="file" name="file" id="file"><br>

    <input type="submit" name="submit" value="提交"></form>

//允许上传的图片后缀

$allowedExts = array("gif","jpeg","jpg","png","doc");

$temp = explode(".",$_FILES["file"]["name"]);

echo $_FILES["file"]["size"];

$extension = end($temp);

if((($_FILES["file"]["type"] == "images/gif")

    ||($_FILES["file"]["type"] == "image/jpeg")

    ||($_FILES["file"]["type"] == "image/jpg")

    ||($_FILES["file"]["type"] == "image/pjpeg")

    ||($_FILES["file"]["type"] == "image/x-png")

    ||($_FILES["file"]["type"] == "image/png")

    ||($_FILES["file"]["type"] == "application/msword"))

    &&($_FILES["file"]["size"] < 204800)

    && in_array($extension,$allowedExts)){    if($_FILES["file"]["error"] > 0){       

    echo "错误：: ".$_FILES["file"]["error"]."<br>";

    }else{       

    echo "上传文件名: ".$_FILES["file"]["name"]."<br>";       

    echo "文件类型: ".$_FILES["file"]["type"]."<br>";       

    echo "文件大小: ".($_FILES["file"]["size"]/1024)."kB<br>";       

    echo "文件临时存储的位置: ".$_FILES["file"]["tmp_name"]."<br>";        //判断当前目录下的upload目录是否存在

        //如果没有upload目录, 你需要创建它，upload目录权限为 777

        if(file_exists("upload/".$_FILES["file"]["name"])){           

        echo $_FILES["file"]["name"]."文件已经存在。";

        }else{           

        //如果upload 目录不存在该文件则将文件上传到upload目录上s

            move_uploaded_file($_FILES["file"]["tmp_name"],"upload/".$_FILES["file"]["name"]);           

            echo "文件存储在: "."upload/".$_FILES["file"]["name"];

        }

    }

}else{   

echo "非法的文件格式";

}

bool move_uploaded_file ( string $filename , string $destination )

$filename:上传文件的文件名

$destination:移动文件到这个位置

<script src="../js/jquery-3.3.1.min.js" type="text/javascript"></script>

<script src="jquery.uploadifive.min.js" type="text/javascript"></script>

<link rel="stylesheet" type="text/css" href="uploadifive.css">

<form>

    <p id="queue"></p>

    <input id="file_upload" name="file_upload" type="file" multiple="true">

</form>

<script type="text/javascript">

        <?php $timestamp = time();?>

        $(function () {

            $('#file_upload').uploadifive({             

              'auto' : true,         

              //是否自动上传，默认true

                'checkScript' : '\.\/js\/uploadify\/check-exists.php', //检查文件路径

                'formData' : {                  

                 &#39;timestamp&#39; : &#39;<?php echo $timestamp;?>&#39;,                  

                 &#39;token&#39; : &#39;<?php echo md5(&#39;unique_salt&#39;.$timestamp);?>&#39;,

                },              

                 'onInit' :  function(){

                    $('p.uploadifive-button').show();

                },              

                 'queueID' : 'queue',   //进度条的显示位置

                'uploadScript' : 'demo\/uploadifive.php',       //上传路径脚本

                'onUploadComplete' : function(file,data){  //文件上传成功后执

//                  console.log(file);

                },               

                'onError'      : function(errorType) {

                    console.log(errorType);                  

                     var msg = '文件上传有误';                   

                     switch(errorType) {                       

                     case 'FORBIDDEN_FILE_TYPE':

                            msg = '错误的上传文件类型';                           

                            break;

                    }

                    alert('错误提示: ' + msg);

                }

            });

        });    </script>