PHP实战：文件上传

文件上传代码练习：

单文件上传

<?php
// printf("<pre>%s</pre>",print_r($_FILES,true));
class upException extends Exception
{
    public function __toString()
    {
        return '错误信息：'.$this->message.';错误代码：'.$this->code;
    }
}
try{
// echo $type;
// echo $name,$type,$tmp_name,$error,$size;
switch($error)
{
    case UPLOAD_ERR_OK:
        // var_dump(trim(strstr($type,'/'),'/'));
        // var_dump(trim(strstr($type,'/',true),'/')!=='jpeg');
        $ty=trim(strstr($type,'/'),'/');
        if($ty==='jpeg'){
            if(file_exists($tmp_name)&&is_uploaded_file($tmp_name))
                {   
                    $obj_type=$ty;
                    $obj_file='images/'.time().'.'.$obj_type;
                    move_uploaded_file($tmp_name,$obj_file);
                }
         exit("<script>alert('上传成功');location.href='demo1.php'</script>");
            }else{
                exit("<script>alert('格式不正确，请重新上传!');location.href='demo1.php'</script>");
            }
    break;
    case UPLOAD_ERR_INI_SIZE:
        throw new upException('文夹过大，超过php限制',1);
    break;
    case UPLOAD_ERR_FORM_SIZE:
        throw new upException('文件过大，超过表单限制',2);
    break;
    case UPLOAD_ERR_PARTIAL:
        throw new upException('上传文件不完整',4);
    break;
    case UPLOAD_ERR_NO_FILE:
        throw new upException('没有文夹上传',5);
    break;
    case UPLOAD_ERR_NO_TMP_DIR:
        throw new upException('无临时目录',6);
    break;
    case UPLOAD_ERR_CANT_WRITE:
        throw new upException('权限不够，文件写入失败',7);
    break;
    default:
    echo "未知错误";
}}catch(upException $e){
    echo $e;
}

多文件上传

<?php
// printf("<pre>%s</pre>",print_r($_FILES,true));
class upException extends Exception
{
    public function __toString()
    {
        return '错误信息：'.$this->message.';错误代码：'.$this->code;
    }
}
foreach($_FILES as $file){
extract($file);
// echo $name;
try{
// echo $type;
// echo $name,$type,$tmp_name,$error,$size;
switch($error)
{
    case UPLOAD_ERR_OK:
        // var_dump(trim(strstr($type,'/'),'/'));
        // var_dump(trim(strstr($type,'/',true),'/')!=='jpeg');
        $ty=trim(strstr($type,'/'),'/');
        if($ty==='jpeg'){
            if(file_exists($tmp_name)&&is_uploaded_file($tmp_name))
                {   
                    $obj_type=$ty;
                    $obj_file='images/'.trim($name,'.jpg').time().'.'.$obj_type;
                    // echo $obj_file,'<br>';
                    move_uploaded_file($tmp_name,$obj_file);
                }
            }else{
                echo ("<script>alert('格式不正确，请重新上传!');location.href='demo2.php'</script>");
            }
    break;
    case UPLOAD_ERR_INI_SIZE:
        throw new upException("{$name}文夹过大，超过php限制",1);
    break;
    case UPLOAD_ERR_FORM_SIZE:
        throw new upException("{$name}文件过大，超过表单限制",2);
    break;
    case UPLOAD_ERR_PARTIAL:
        throw new upException("{$name}上传文件不完整",4);
    break;
    case UPLOAD_ERR_NO_FILE:
        throw new upException("{$name}没有文夹上传",5);
    break;
    case UPLOAD_ERR_NO_TMP_DIR:
        throw new upException("{$name}无临时目录",6);
    break;
    case UPLOAD_ERR_CANT_WRITE:
        throw new upException("{$name}权限不够，文件写入失败",7);
    break;
    default:
    echo "未知错误";
}
// exit("<script>alert('上传成功');location.href='demo2.php'</script>");
}catch(upException $e){
    echo ("<script>alert('{$e}');</script>");
}}
exit("<script>alert('上传完毕！');location.href='demo2.php'</script>");

批量上传：

<?php
// printf("<pre>%s</pre>",print_r($_FILES,true));
// die();
class upException extends Exception
{
    public function __toString()
    {
        return '错误信息：'.$this->message.';错误代码：'.$this->code;
    }
}
$files=$_FILES['my_file'];
foreach($files['error'] as $key=>$value){
try{
switch($value)
{
    case UPLOAD_ERR_OK:
        // var_dump(trim(strstr($type,'/'),'/'));
        // var_dump(trim(strstr($type,'/',true),'/')!=='jpeg');
        $ty=trim(strstr($files['type'][$key],'/'),'/');
        if($ty==='jpeg'){
            if(file_exists($files['tmp_name'][$key])&&is_uploaded_file($files['tmp_name'][$key]))
                {   
                    $obj_type=$ty;
                    $obj_file='images/'.trim($files['name'][$key],'.jpg').time().'.'.$obj_type;
                    // echo $obj_file,'<br>';
                    move_uploaded_file($files['tmp_name'][$key],$obj_file);
                }
            }else{
                echo ("<script>alert('{$files['name'][$key]}格式不正确，请重新上传!');</script>");
            }
    break;
    case UPLOAD_ERR_INI_SIZE:
        throw new upException("{$files['name'][$key]}文夹过大，超过php限制",1);
    break;
    case UPLOAD_ERR_FORM_SIZE:
        throw new upException("{$files['name'][$key]}文件过大，超过表单限制",2);
    break;
    case UPLOAD_ERR_PARTIAL:
        throw new upException("{$files['name'][$key]}上传文件不完整",4);
    break;
    case UPLOAD_ERR_NO_FILE:
        throw new upException("{$files['name'][$key]}没有文夹上传",5);
    break;
    case UPLOAD_ERR_NO_TMP_DIR:
        throw new upException("{$files['name'][$key]}无临时目录",6);
    break;
    case UPLOAD_ERR_CANT_WRITE:
        throw new upException("{$files['name'][$key]}权限不够，文件写入失败",7);
    break;
    default:
    echo "未知错误";
}}catch (upException $e){
    echo ("<script>alert('{$e}');</script>");
}}
exit("<script>alert('上传完毕！');location.href='demo3.php'</script>");

演示结果

总结：

1、上传文件信息关键字:$_FILES(name、type、tmp_name、error、size);
2、把上传文夹从临时目录移动过到目标目录：move_uploaded_file('tmp_name','目标文夹目录')；
3、is_uploaded_file();判断上传文件的合法性
4、文件前端以表单的形式上传：

 <form action="act3.php" method="POST" enctype="multipart/form-data">
     //文件上传，上传方式：post,上传编码：multipart/form-data
        <fieldset>
            <legend>文件上传</legend>
            //隐藏域，用来限制上传文件大小
            <input type="hidden" name="MAX_FILE_SIZE" value="10000000">
            //上传文件：multiple：多选
            <input type="file" name="my_file[]" multiple>
            <button>上传</button>
        </fieldset>
    </form>

5、在上传文件时：需查看设置php.ini中：file_uploads、upload_tmp_dir、max_file_uploads、post_max_size、upload_max_filesize等相关设置
6、php常用函数：
strstr($str,'分割字符'，true|flase)：分割字符
trim($str,'去掉的字符')：去掉字符两端的不需要的字符
file_exists($file);检测文件试问存在
7、script函数:
alert('提示内容'):单传提示函数；
location.href='';自动跳转至……；