文件上传与错误处理

上传文件设置两个属性

method：POST,GET在地址栏，最大数据量才4K，不满足大文件需求。
enctype=”multipart/form-data”

单文件上传

<?php
    printf('<pre>%s</pre>',print_r($_FILES,true));
    if(isset($_FILES['my_pic'])){
        //原始文件名
        $name = $_FILES['my_pic']['name'];
        // 临时文件名
        $tmpName = $_FILES['my_pic']['tmp_name'];
        // 错误代码
        $error = $_FILES['my_pic']['error'];
        if($error > 0){
            $tips = '<span style="color:red">上传失败!</span><br>';
            switch($error){
                case 1:
                    $tips .= '超过php.ini允许上传的大小！';
                    break;
                case 2:
                    $tips .= '超过表单中MAX_FILE_SIZE允许上传的大小！';
                    break;
                case 3:
                    $tips .= '文件只有部分被上传！';
                    break;
                case 4:
                    $tips .= '没有文件被上传！';
                    break;
                case 6:
                    $tips .= '找不到临时目录！';
                    break;
                case 7:
                    $tips .= '文件写入失败，请检查目录权限！';
                    break;                                
            }
            echo "<p>$tips</p>";
        }else{
            // echo '上传成功！';
            // 判断上传方式是否合法？
            if(is_uploaded_file($tmpName)){
                // 文件类型白名单
                $allow = ['jpg', 'jpeg', 'png', 'gif'];
                // 获取扩展名
                $ext = pathinfo($name)['extension'];
                if(in_array($ext, $allow)){
                    // 类型合法，设置指定目录
                    $path = 'uploads/';
                    // 重命名，防止重名。
                    $dest = $path.md5($tmpName).'.'.$ext;
                    // 移动到指定目录
                    if(move_uploaded_file($tmpName, $dest)){
                        echo '上传成功！';
                        echo "<img src='$dest' width='50'>";
                    }else{
                        echo '上传失败！';
                    }
                }else{
                    echo '<p>不允许的类型！</p>';
                }
            }else{
                echo '<p>非法方式上传！</p>';
            }
        }
    }
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="" method="POST" enctype="multipart/form-data">
        <fieldset>
            <legend>单文件上传</legend>
            <!-- name="my_pic":给服务器段语言用的变量，PHP可以用$FILE来获取。 -->
            <!-- <input type="hidden" name="MAX_FILE_SIZE" value="8"> -->
            <input type="file" name="my_pic">
            <button>上传</button>
        </fieldset>
    </form>
</body>
</html>

多文件上传

逐个上传

方式1

<?php
    printf('<pre>%s</pre>',print_r($_FILES,true));
    foreach($_FILES as $file){
        if($file['error'] === 0){
            $dest = 'uploads/'. $file['name'];
            move_uploaded_file($file['tmp_name'], $dest);
            echo "<img src='$dest' width='150'>";
        }
    }
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="" method="POST" enctype="multipart/form-data">
        <fieldset>
            <legend>多文件上传-1：逐个上传</legend>
            <input type="file" name="my_pic1">
            <input type="file" name="my_pic2">
            <input type="file" name="my_pic3">
            <button>上传</button>
        </fieldset>
    </form>
</body>
</html>

方式2

<?php
    printf('<pre>%s</pre>',print_r($_FILES,true));
    if(isset($_FILES['my_pic'])){
        foreach($_FILES['my_pic']['error'] as $key=>$error){
            // php5.3以后支持UPLOAD_ERR_OK常量
            if($error === UPLOAD_ERR_OK){
                // 临时文件名
                $tmpName = $_FILES['my_pic']['tmp_name'][$key];
                // 原始文件名
                $name = $_FILES['my_pic']['name'][$key];
                $dest = 'uploads/'. $name;
                move_uploaded_file($tmpName, $dest);
                echo "<img src='$dest' width='150'>";
            }
        }
    }
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="" method="POST" enctype="multipart/form-data">
        <fieldset>
            <legend>多文件上传-2</legend>
            <input type="file" name="my_pic[]">
            <input type="file" name="my_pic[]">
            <input type="file" name="my_pic[]">
            <button>上传</button>
        </fieldset>
    </form>
</body>
</html>

批量上传

<?php
    printf('<pre>%s</pre>',print_r($_FILES,true));
    if(isset($_FILES['my_pic'])){
        foreach($_FILES['my_pic']['error'] as $key=>$error){
            // php5.3以后支持UPLOAD_ERR_OK常量
            if($error === UPLOAD_ERR_OK){
                // 临时文件名
                $tmpName = $_FILES['my_pic']['tmp_name'][$key];
                // 原始文件名
                $name = $_FILES['my_pic']['name'][$key];
                $dest = 'uploads/'. $name;
                move_uploaded_file($tmpName, $dest);
                echo "<img src='$dest' width='150'>";
            }
        }
    }
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="" method="POST" enctype="multipart/form-data">
        <fieldset>
            <legend>批量上传</legend>
            <!-- 与逐个上传方式2相比，只保留一行下列代码,最后还要增加multiple属性。 -->
            <input type="file" name="my_pic[]" multiple>
            <button>上传</button>
        </fieldset>
    </form>
</body>
</html>

Correcting teacher：

PHPz

Correction status：qualified

Teacher's comments：

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