upload文件上传

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 = '大小超过了php.ini中的允许上传的文件大小';
                break;
            case 2:
                $tips = '大小超过了表单中(MAX_FILE_SIZE)的允许上传的文件大小';
                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 5:
                $tips = '找不到临时目录';
                break;
            case 6:
                $tips = '文件写入失败,请检查目录权限';
                break;
        }
        echo "<p>$tips</p>";
    }   else{
        // 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', ''];
            // 扩展名
            $ext = pathinfo($name)['extension'];
            if  (in_array($ext, $allow)){
                // 如果上传方式合法,且是允许的类型,则可以移动到指定的目录中了
                $path = 'uploads/';
                // 为了防止同名覆盖,应该给目标文件名重命名
                $dest = $path . md5($name) . '.' . $ext;
                // 将文件从临时目录移动到目标目录中
                if(move_uploaded_file($tmpName,$dest)){
                    echo '<p>上传成功</p>';
                    echo "<img src='$dest' width='200'>";
                }   else{
                }
            }   else{
                echo '<p>文件类型错误</p>';
            }
        }   else{
            echo '<p>上传方式非法</p>';
        }
    }
}
?>
<!DOCTYPE html>
<html lang="zh-CN">
<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>支持文件上传的表单, $_FILES</title>
</head>
<body>
    <!-- 
        1. method: POST 
        2. ecntype: multipart/form-data
    -->
    <form action="" method="POST" enctype="multipart/form-data">
        <fieldset>
            <legend>单文件上传</legend>
            <!-- name="my_pic": 给服务器编程语言用的变量名,$_FILES  -->
            <!-- <input type="hidden" name="MAX_FILE_SIZE" value="800000"> -->
            <input type="file" name="my_pic">
            <button>上传</button>
        </fieldset>
    </form>
</body>
</html>

多文件上传-1:逐个上传

<?php
// $_FILES
printf('<pre>%s</pre>', print_r($_FILES, true));
// foreach
foreach($_FILES as $file){
    // 只要判断$file['error'] ===0 表示上传成功
    if($file['error']===0){
        // 暂不加密目标文件名    
        $dest = 'uploads/' . $file['name'];
        // 移动到目标目录中
        move_uploaded_file($file['tmp_name'], $dest);
        // 预览
        echo "<img src= '$dest' width='200'>";
    }
}
?>
<!DOCTYPE html>
<html lang="zh-CN">
<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>多文件上传-1</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>

多文件上传-2:逐个上传

<?php
// $_FILES
printf('<pre>%s</pre>', print_r($_FILES, true));
if(isset($_FILES['my_pic'])){
// foreach
foreach($_FILES['my_pic']['error'] as $key=>$error){
    // 0 => UPLOAD_ERR_OK
    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];
        // 暂不加密目标文件名    
        $dest = 'uploads/' . $name;
        // 移动到目标目录中
        move_uploaded_file($tmpName, $dest);
        // 预览
        echo "<img src= '$dest' width='200'>";
    }
}
}
?>
<!DOCTYPE html>
<html lang="zh-CN">
<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>多文件上传-2</title>
</head>
<body>
    <form action="" method="POST" enctype="multipart/form-data">
        <fieldset>
            <legend>多文件上传-2:逐个上传</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>

多文件上传-3:批量上传

<?php
// $_FILES
printf('<pre>%s</pre>', print_r($_FILES, true));
if(isset($_FILES['my_pic'])){
// foreach
foreach($_FILES['my_pic']['error'] as $key=>$error){
    // 0 => UPLOAD_ERR_OK
    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];
        // 暂不加密目标文件名    
        $dest = 'uploads/' . $name;
        // 移动到目标目录中
        move_uploaded_file($tmpName, $dest);
        // 预览
        echo "<img src= '$dest' width='200'>";
    }
}
}
?>
<!DOCTYPE html>
<html lang="zh-CN">
<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>多文件上传-3</title>
</head>
<body>
    <form action="" method="POST" enctype="multipart/form-data">
        <fieldset>
            <legend>多文件上传-3:批量上传</legend>
            <input type="file" name="my_pic[]" multiple>
            <button>上传</button>
        </fieldset>
    </form>
</body>
</html>

单文件上传

多文件上传-1:逐个上传

多文件上传-2:逐个上传

多文件上传-3:批量上传

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