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PHP图片、文件批量上传代码
PHP文件批量上传
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PHP图片、文件批量上传代码

Jun 13, 2016 am 09:26 AM
php upload code picture us batch document yes First still

PHP图片、文件批量上传代码

   不管是文件还是图片批量上传我们第一个是在html中做name=userfile[]这种数组变量,在php接受中我们做for ($_i=0; $_i

  例子

 代码如下  

session_start();
?>




PHP文件批量上传


<script><br /> $(document).ready(function() {<br /> $('#cont').val($('.file #file').size());<br /> $('#send').eq(0).click(function() {<br /> var filesize=$('.file #file').size();<br /> $('.file').append("<input type='file' name='userfile[]' id='file'/>");<br /> $('#cont').val(filesize+1);<br /> });<br /> });<br /> </script>



PHP文件批量上传




if ($_GET['up']==up) {
//防止重复提交
if ($_SESSION['file']==$_GET['irand']) {
$_cont=intval($_POST['cont']);   //将file框总数接收并转换成整型
$_size=20000;                    //设置限制文件大小
$_dir='pdir/';                   //文件保存目录
function size($_size) {
//判断文件大小是否大于1024bit 如果大于,则将大小取值为KB,以此类推
if ($_size>1024*1024) {
return round($_size/1024/1024,2).' MB';
}else if ($_size>1024) {
$_size=$_size/1024;
return ceil($_size).'KB';
}else {
return $_size.' bit';
}
}
//设置上传图片的类型,设置图片上传大小
$_upfiles = array('image/jpeg','image/pjpeg','image/png','image/x-png','image/gif');
//利用for循环上传文件
for ($_i=0; $_i if (is_array($_upfiles)) {
if (!in_array($_FILES['userfile']['type'][$_i],$_upfiles)) {
exit('请上传格式为:jpg,png,gif的文件
返回');
}
}
//判断文件大小
if ($_FILES['userfile']['size'][$_i]>$_size) {
exit('上传文件不能超过:'.size($_size));
}
//检测文件是否已经上传
if ($_FILES['userfile']['error'][$_i]>0) {
switch ($_FILES['userfile']['error'][1]) {
case 1: echo '上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值';
break;
case 2: echo '上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值';
break;
case 3: echo '文件只有部分被上传';
break;
case 4: echo '没有文件被上传';
break;
case 6: echo '找不到临时文件夹';
break;
case 7: echo '文件写入失败';
break;
}
exit;
}
//获取文件扩展名
if (!is_dir($_dir)) {
mkdir($_dir,0700);
}
//生成随笔数
$_rand=mt_rand(0,100000);
//获取文件扩展名
$_n=explode('.',$_FILES['userfile']['name'][$_i]);  //将文件名分割
$_file_len=count($_n);         //返回数组长度
//确保获取的扩展名是最后一个.后面的
$_name=$_dir.time().'_'.$_rand.'.'.$_n[$_file_len-1];
//移动文件到指定的目录
if (is_uploaded_file($_FILES['userfile']['tmp_name'][$_i])) {
if (!@move_uploaded_file($_FILES['userfile']['tmp_name'][$_i],$_name)) {
exit('文件移动失败');
}else {
echo '文件上传成功
';
echo '文件路径:'.$_name.'
';
echo '文件大小:'.size(filesize($_name));
echo '
返回继续上传';
}
}else {
exit('上传的临时文件不存在,无法将文件移动到指定文件夹');
}
}
//销毁session变量,有几种方法
//第一种,销毁所有session变量:session_destroy();
//第二种:销毁单个如:$_SESSION['file']=''
session_destroy();
exit;

}else {
exit('您已经提交过了,不能重复提交
返回');
}
}
?>



















  核心原理分析

  在多文件上传中我们前台最重要的是

 代码如下  




  这几行代码有细节的朋友会发现name="userfile[]"了,这个是以数组存储了,这样我们如果使用js也可以这样增加就可以了,那么在php是如何获取的呢

  在多文件上传中php处理是一个关键

 代码如下  

for ($_i=0; $_i if (is_uploaded_file($_FILES['userfile']['tmp_name'][$_i])) {
if (!@move_uploaded_file($_FILES['userfile']['tmp_name'][$_i],$_name)) {
exit('文件移动失败');
}else {
echo '文件上传成功
';
echo '文件路径:'.$_name.'
';
echo '文件大小:'.size(filesize($_name));
echo '
返回继续上传';
}
}

  这里显示很简单我们会看到有一个for,for就是遍历数组,遍历userfile[]数组,然后再由$_FILES['userfile']['tmp_name'][$_i]来获取不同文件图片再进行上传即可,注意[$_i]就是你的多文件上传项了,只是保存在了数组中。

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